Technical Summary
Contents
Overview3
Architectural Summary Specification
4
Building Description
5
Location Map
6
Design Criteria
7
Floor Areas and Heights
7
Floor Plans
8
Exterior Envelope
15
Internal Design and Finishes
16
Public Art
19
Refuse and Waste
20
Accessibility20
BREEAM 20
Fire Safety
21
Acoustic Performance
21
Sanitary Provision
22
Structure23
Building Services Outline Specification
Design Criteria
Mechanical Services Description
Controls Services Description
Electrical Services Description
Public Health Services Description
Vertical Transportation Services
26
27
29
30
31
35
37
Professional Team
40
Imagery42
Building Elevations
43
Internal CGIs
45
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 2
Overview
This document is a description of the shell
and core elements of the works
and also the Category A fit-out of the
works carried out by the Developer.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 3
Architectural Summary Specification
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4
Architectural Summary Specification
Introduction
Building Description
Overview
Location
Office Space
The proposal for the redevelopment of
33 Davies Street received Planning Permission
and Conservation Area Consent from the
Westminster City Council on 29th June 2010.
33 Davies Street is situated on Davies Street in
the heart of the Mayfair Conservation Area within
the City of Westminster. The site is situated at
the corner of Davies Street and Grosvenor Street
in the south and the corner of Davies Street and
Three Kings Yard in the north. In addition to these
street façades the building shares a courtyard to
the rear with the residential property at No 32
Grosvenor Street.
The office reception is positioned in the central
bay along Davies Street.
Building Accommodation
The new development has required the complete
demolition of the pre-existing 1930’s building
including the basement and foundations.
The reception is designed to service multiple
tenants and includes a reception area and a rear
waiting area, whilst providing direct access to the
vertical circulation in the central core. An open
feature staircase leads from reception to the
upper floors.
The typical office floors are arranged around
a linear core located against the courtyard
area. Structural columns are arranged around
the perimeter of the building spanning back
to the core and providing flexible column free
floor plates.
The new building consists of:
•Basement: Retail space, bicycle parking and
changing facilities, toilets, refuse store, electrical
sub-station, plant rooms and comms room
•Ground floor: Retail space, office reception,
building manager’s office, toilet
•First to fifth floors: Office accommodation
and associated toilet facilities.
Sub-Division
The building is designed to facilitate both a single
occupier and a multi tenancy arrangement split on
a floor by floor basis.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Retail Space
The retail space at ground floor consists of two
spaces, one either side of the office reception.
Each of these spaces can be sub-divided giving
potentially four retail tenancies. Two structural
openings are provided from the ground floor to
the basement to allow the linking of the retail
areas. The design of the ground floor structural
incorporates a soft spot to allow a third unit
access to the basement. The permanent retail
stairs and lifts to lower ground floor will be
installed as part of the tenants fit-out.
3 3 d av ie s s t r e e t 5
SEYMOUR STREET
CAVENDISH
SQUARE
MARGARET STREET
OXFORD
CIRCUS
BOND
STREET
MARBLE
ARCH
OXFORD STREET
BOND
STREET
HANOVER
SQUARE
BROOK STREET
DAVIES STREET
HYDE PARK
EET
STR
HERTFORD STREET
LY
DIL
CA
C
I
P
ET
TRE
TS
EN
REG
N
TO
AT
STR
CURZON STREET
EET
STR
ND
BO
EY
KEL
BER
EET
STR
S
E
L
AR
CH
EET
STR
N
O
AFT
GR
W
NE
EET
STR
L
L
HI
BERKELEY
SQUARE
OW
ER
VIL
SA
EET
STR
N
UTO
BR
MOUNT STREET
T
EA
GR
ET
TRE
HS
G
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RO
LBO
R
MA
ET
TRE
S
T
UI
ND
CO
EET
STR
LE
AR
EM
ALB
ET
TRE
RS
VE
DO
EET
STR
E
LAN
RK
PA
SOUTH AUDLEY STREET
PARK STREET
GROSVENOR STREET
SOUTH STREET
EET
STR
X
O
DD
MA
EET
STR
ND
BO
UPPER GROSVENOR STREET
HANOVER STREET
W
NE
GROSVENOR
SQUARE
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t REGENT STREET
DUKE STREET
NORTH AUDLEY STREET
PARK STREET
UPPER BROOK STREET
OXFORD STREET
GREEN
PARK
PICCADILLY
CIRCUS
ROYAL
ACADEMY
LY
DIL
CA
C
I
P
ST JAMES’S
SQUARE
ST JAMES’S
PALACE
LL
MA
LL
A
P
Location Map
3 3 d av ie s s t r e e t 6
Architectural Summary Specification
Design Criteria
Floor Areas
Floor Heights
Floor Area (Net Internal)
sq m
sq ft
Basement Retail
Ground South Retail
Ground North Retail
Ground Total Retail
364.1
163.6
179.5
343.1
3,919
1,761
1,932
3,693
Basement and
Ground Retail
707.2
First
Second
Third
Fourth
Fifth
540.75,820
557.25,998
557.46,000
557.25,998
468.65,044
Office Total
2681.1
28,860
3388.3
36,472
Total Net Lettable
7,612
Level
Description
6
Roof
5
Raised
Floor
(Gross)
(mm)
Finished
Floor to
Ceiling
(mm)
Finished
Floor Level
(m AoD)
Structural
Slab Level
(m AoD)
Structural
Slab to
Structural
Slab (over)
(mm)
-
-
44.410
44.160
-
Offices
100
2,700
40.710
40.610
3,550
4
Offices
100
2,675
37.160
37.060
3,550
3
Offices
100
2,675
33.610
33.510
3,550
2
Offices
100
2,675
30.060
29.960
3,550
1
Offices
100
2,675
26.510
26.410
3,550
0
Retail North
0
4,220
21.410
21.310
5,100
0
Office Reception
100
3,750
21.870
21.770
4,640
0
Retail South
0
3,380
22.255
22.255
4,155
B
Retail North
150
2,770
17.860
17.710
3,600
B
Retail Central
150
3,300
17.860
17.710
4,060
B
Retail South
150
3,680
17.860
17.710
4,545
Area of 3.3m2 of soft spot for future lift shaft
opening to the retail units at ground floor
included in measurement.
Areas are on a net internal basis and are subject
to measurement on site as built.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 7
Ground Floor Plan
Reception 140 sq m / 1,504 sq ft
North Retail 179.5 sq m / 1,932 sq ft
South Retail 163.6 sq m / 1,761 sq ft
SIDE ENTRANCE / CYCLE ACCESS
LOUNGE AREA
RISER
LIFT
LIFT
RISER
RECEPTION
Franck Namani
Three Kings Yard
Grosvenor Street
SERVICE
LIFT
Franck Namani
Davies Street
N
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 8
Lower Ground Floor Plan
Retail 364.1 sq m / 3,919 sq ft
38 CYCLE STORE SPACES
LAUNDRY
38 LOCKERS
1
RISER
LIFT
LIFT
2
RISER
Three Kings Yard
Grosvenor Street
SERVICE
LIFT
CHANGING
ROOM
3
4
Franck Namani
Davies Street
N
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 9
First Floor Plan
540.7 sq m / 5,820 sq ft
LIFT
LIFT
RISER
Three Kings Yard
Grosvenor Street
RISER
DOUBLE HEIGHT ENTRANCE
Davies Street
N
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 1 0
Second Floor Plan
557.2 sq m / 5,998 sq ft
LIFT
LIFT
RISER
Three Kings Yard
Grosvenor Street
RISER
Davies Street
N
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 1 1
Third Floor Plan
557.4 sq m / 6,000 sq ft
LIFT
LIFT
RISER
Three Kings Yard
Grosvenor Street
RISER
Davies Street
N
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 1 2
Fourth Floor Plan
557.2 sq m / 5,998 sq ft
LIFT
LIFT
RISER
Three Kings Yard
Grosvenor Street
RISER
Davies Street
N
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 1 3
Fifth Floor Plan
468.6 sq m / 5,044 sq ft
LIFT
LIFT
RISER
Three Kings Yard
Grosvenor Street
RISER
Davies Street
N
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 1 4
Architectural Summary Specification
Design Criteria, cont’d
Exterior Envelope
Planning Grid
Design Concept
Materials and Components
The building is designed on a 1.5 metre planning
grid, following through from window location to
ceiling and lighting layouts.
The proportion of the overall building mass is
broken down into a series of five bays along
Davies Street and two along both Grosvenor
Street and Three Kings Yard. This division is
reflected in plan with a projection of the central
and end bays.
The masonry elements will be pre-cast concrete
panels faced in brick and stone.
The materials and finishes have been designed as
a careful response to the prevailing character of
both the immediate and the wider surrounding
conservation area. A rusticated Portland Stone
base forms the base of the building above which
the first floor is emphasised with taller windows
and stone surrounds and string course. Similarly
following the classical tradition is the presence
of a stone cornice between third and fourth floor,
above which the windows form the equivalent of a
frieze in brickwork.
The bricks are a handmade red brick with a face
size of 290x50mm laid as pre-cast elements in a
custom designed ‘Flemish’ bond.
Building Regulations, Statutory Legislation and
Construction Standards
The building is designed to the current edition
of the Approved Documents of the Building
Regulations and based on the recommendations
of the latest edition of the British Standards
BS/BS EN.
Where there is no relevant British Standard then
the appropriate industry recognised and accepted
European or International Standards will be used
(where not over-ruled by this BBD).
Design Life of Building Components
The building is to have a design life developed
in accordance with the procedures set out as per
BS ISO 15686 and BS 7543:2000. Services plant
and equipment generally in accordance with
CIBSE Guide to the Ownership, Operation and
Maintenance of Building Services March 2000
Table B14.3.
The design life of the building structure,
maintainable without major replacement, will be
a minimum of 60 years.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Brick Faced Cladding
Stone Faced Cladding
Stonework is fabricated as pre-cast concrete
elements faced with Portland Basebed Stone with
Cornish De Lank Granite base.
The elevation is composed of recessed brickwork
details on different planes.
The windows are to be bronze anodised aluminium
framed with vertical and horizontal sub-divisions.
The fifth floor is conceived as a traditional
composition of a metal roof finish and dormers.
The dormers are highlighted by a pre-cast
concrete (to match Portland Stone) surround,
continuing the language used for the other
windows. The recessed panels at the roof are clad
in a bronze finished copper alloy.
The masonry elements will be pre-cast concrete
panels faced in brick and stone.
5th Floor Pre-cast Concrete Cladding
Acid etched pre-cast concrete cladding to match
Portland Stone.
Shop Front Glazing and Doors
Bespoke Architectural Bronze framing with single
glazed low iron glass. Double glazed doors with
Architectural Bronze frame and ironmongery.
3 3 d av ie s s t r e e t 1 5
Architectural Summary Specification
Exterior Envelope, cont’d
Internal Design and Finishes
Two Storey Office Entry Screen
Reception Design Concept
Toilets
Architectural Bronze framework. Glass is double
glazed low iron glass. Double glazed doors,
three metre high, with Architectural Bronze
frame and bronze ironmongery. One set of doors
powered assisted to provide access to people
with disabilities.
The palette of high quality materials emperador
marble, routed limestone, American walnut, bronze
and finest Italian leather are all used to create a
rich, welcoming space.
Toilet fit-out will comprise:
Bronze anodised aluminium slim profile side hung
openable windows. Glass is double glazed low iron
high performance solar control glass.
Roof Plant Enclosure
The plant enclosure consists of acoustically
treated bronze anodised extruded aluminium
louvres & doors.
A bespoke reception desk is provided with
small power sockets, telephone point, three
compartment trunking back to the adjacent
electrical riser. The area incorporates localised
heating and a floor rail to prevent the reception
chair on wheels from damaging the tube
feature wall.
Finishes are:
•Wall finishes: Stone, leather and timber panels
•Floor finishes: Honed hard limestone including
mats and matwell at doors
Inverted roof system on concrete deck. High
performance modified bitumen reinforced
membrane, drainage layer, insulation, separating
membrane and 600x600x50mm concrete paving.
Roof finishes to include extensive sedum green
roof system.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t •Ceiling: White painted dry lining/gypsum plank/
timber veneered ceiling
•Doors: Walnut timber veneered and with solid
hardwood frame
•Toilet partitions: Full height 45mm thick solid
core high quality walnut veneered panels
•Lighting: Downlighters switched from the toilet
lobby PIR detector. Concealed lighting at rear
of cubicles
•Sundry toilet items: Mirrors, single toilet roll
and spare holders, paper towel dispensers, coat
hooks, door stops, and towel bins
•Full height mirror
•Vanity tops: Limestone
•Ceiling finishes: painted drylined ceilings
•GRG (glass reinforced gypsum) upstands at
concealed lighting
Roof Construction
•Floor: Fully vitrified Porcelain Ceramic
•Skirtings: Brushed stainless steel
Office Entrance Lobby
Windows First To Fifth Floor
•Walls: Fully vitrified Porcelain Ceramic, etched
glass panels, and drylining
•Bespoke decorative panel behind reception desk
Programmable feature lighting is provided in the
entrance lobby, designed by the specialist Lighting
Design Consultant.
The sanitary fittings for the toilets are as follows:
•White vitreous china wall mounted WC pans,
seats and covers together with duct mounted
6 litre cisterns, flush pipes, and flushing
handles/buttons
•Vitreous china basins with automatic stainless
steel mixer spray taps
3 3 d av ie s s t r e e t 1 6
Architectural Summary Specification
Internal Design and Finishes, cont’d
Disabled Persons Toilet
Shower Changing Room
Lift Finishes
High quality finishes are as those in the main toilets.
Space is provided for a shower room and changing
facility for cyclists and staff within the basement
area, 3 No. showers & 1 No. disabled shower/WC
with appropriate provision for drainage. 38 cycle
spaces, 38 lockers and a laundry room are provided.
Passenger lift cars: Architectural Bronze internal
and external doors and architrave at ground
floor with bronze anodised aluminium doors
and architrave on the upper floors. High quality
wall finishes of Italian leather panels with black
American Walnut trim. Polyester coated metal
ceiling with concealed cove and point lighting.
Shell Gris cladding with emperor marble floor
finish to match entrance lobby. Architectural
bronze control panel and handrails.
Lighting is by downlighters switched from
a PIR within the disabled person toilet.
Disabled person sanitary fittings and stainless
steel grab rails to be provided.
Finishes as follows:
Disabled Alarm with facility to link to the BMS
in Category A.
•Walls: Ceramic fully vitrified Porcelain tiles from
Domus range and drylining
Sundry toilet items as main toilets.
•Floor and skirtings: Ceramic Vitreous Porcelain
tiles from Domus range
•Ceiling: White painted dry lining/ metal
ceiling pan
Cleaners Cupboard
•Doors: Walnut veneered and with solid
hardwood frame
A cleaner’s cupboard incorporating sink, hot
and cold water and lighting are provided, at all
office levels:
•Shower partitions: Full height drylined partitions
with ceramic tiles
•Walls are painted dry lining and ceramic
tiled sink splash back
•Floor and skirtings are ceramic tile
•Shelving
•No ceiling
•Lighting: Downlighters switched from the toilet
lobby PIR detector
•Sundry toilet items: Mirrors, single toilet roll
and spare holders, paper towel dispensers, coat
hooks, door stops, and towel bins
•Counter tops: Hardwood
Doors, Frames and Ironmongery
Flush solid core walnut veneered doors with
hardwood frames and lippings with polished finish
are provided to all doors at office levels. Doors
have stainless steel finish ironmongery.
Painted flush steel doors and frames are provided
in general service areas, such as plant rooms,
storage areas, service corridors, etc and service
access doors/panels around the cores.
•Coat hooks in WC cubicles and general space
•Lockers and benches: Hardwood
BMS/Security Room/Fire Command Centre
Office Finishes
This room has the following finishes:
Office external and core walls are paint finished.
•Painted drylined walls
•Metal tile ceiling
•Raised access floor with carpet tile
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 1 7
Architectural Summary Specification
Internal Design and Finishes, cont’d
Category A Office Fit-Out Finishes
Floor Finishes
Ceiling Finishes
Finishes
Main stair lobbies: Carpet (painted/vinyl below
ground floor).
Main landings (main core): Painted drylining with
skim coat.
The office areas will be finished to following
Category A standard.
Plant rooms: Sealed/painted concrete with skirting
as appropriate.
Office ceiling: Tegular 750x750mm metal grid with
750x750mm modular perforated metal ceiling
tiles with acoustic pad backing. Tiles formed with
600x600mm solid edge opening to accept light
fittings and diffusers.
Service corridors: Sealed concrete.
Storage: Sealed concrete.
Basement back of house: Painted soffit.
Wall Finishes
Stairs and secondary stair lobbies: Painted
drylining. Stair core 2 to be impact resistant board.
Office core walls and lift lobbies: Painted
drylining with skim coat to accept the Category
A Specification finishes. East wall facing office
reinforced to allow hanging of art.
Walls in plant rooms: Painted fair faced blockwork
and/or drylining.
Service corridors: Painted fair faced blockwork
/concrete.
Escape Stair Finishes
Pre-cast concrete generally with carpet finish
with nosings.
Concrete/steel landings, carpet finish.
Stainless steel handrails and balusters.
Painted dry lining stair walls.
Floors
Medium grade (to PSA Method of Building
Performance Specification MOB PF2 PS/SPU
March 1992) raised access flooring with a nominal
depth of 100mm on all office floors (inclusive of
panel), comprising 600x600mm carpet tiles (not
to be installed).
Note: The MOB loadings for medium grade are
as follows:
•Concentrated static load: Not less than 4.5kN
over 300mm sq and not less than 3.0kN over
25mm sq
•Uniformly distributed load: Not less than and
8.0kN/m2
Painted soffits.
Stone clad feature stair from reception to
first floor.
EDF incoming service room: To EDF specification.
All necessary plenum barriers, fire breaks and
closure details are provided.
The concrete floor has a sealant applied to it prior
to the installation of the raised floor.
External Finishes
Replace to new levels perimeter pavement to
building threshold, comprising York Stone and
Granite Kerbs.
Applied MDF painted skirting to the drylined core
walls, perimeter walls (solid).
York Stone flooring to the Portico.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 1 8
Architectural Summary Specification
Category A Office Fit-Out Finishes, cont’d
Walls
Internal Signs
Base mist coat plus two coats of vinyl matt
emulsion finish on skim coat to plasterboard walls,
is provided on core walls, internal and external
columns and other exposed walls in office areas.
Statutory signs are provided in net lettable space
as follows:
•Fire exits
•Fire doors
•Fire fighting lift lobbies
Public Art
The portcullis gates to the entrance to the
office are a special commission by artist Wendy
Ramshaw. Cast in bronze the three gates
mechanically move up to an open position during
working hours and can be lowered to a closed
position outside working hours.
•All other statutory signs as required
Suspended Ceilings
Suspended ceiling comprising fully accessible
polyester powder coated perforated metal pan
ceiling tiles, fixed into a visible tegular drop-in
suspension system. Suspended ceiling includes
fully recessed luminaries/downlighters, and
grilles etc fire stopping, access panels and
insulation matting fully concealed in black plastic
wrapping. Suspension system and fixings are of
galvanised steel.
•Office and retail tenant signage, builderswork
and brackets by tenants
Blinds
Anti-glare blinds to be provided to all
office windows.
The ceiling tile system is laid out on a 750mm
modular grid centred on the base building
planning grid.
Plasterboards margins to perimeter on galvanised
steel suspension system. The office ceiling system
has an acoustical absorption NRC value of
approximately 0.8.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 1 9
Architectural Summary Specification
Refuse and Waste
Accessibility
BREEAM
The waste storage room serving the building
is located at basement level. In total fourteen
number 1100 litre Euro bins are provided in
accordance WCC Waste Storage Guidance.
Accessibility of the building is detailed
in David Bonnet Associates AFE Stage D
accessibility report.
The development is designed to achieve BREEAM
2008 ‘Excellent’ rating.
Refuse is collected on Grosvenor Street.
Provisions for people with disabilities will be in
accordance with the Building Regulations – Part M
2010 and in line with the DDA requirements.
Means of Escape
Associated with the stair cores a place of refuge
has been allocated per stair. An appropriate
facility is provided for communication between
the refuge and the fire control centre by people
with disabilities.
Circulation
Reception area only: One power assisted pivot
door to office Reception (power operated) to suit
peak through flow.
Retail units: Manual door with provision for cable
connection for power assisted door mechanism
(door mechanism to be provided by retail tenant
if required).
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 2 0
Architectural Summary Specification
Fire Safety
Acoustic Performance
For fire purposes the building is designed to
comply with the requirements of statutory
regulations and authorities. Refer to Fire Strategy
Report by SAFE.
The Base Building design allows for the office
space, subject to the completion of fit–out in
accordance with the Category A Specification,
to achieve a maximum noise criterion of NR38
from the Base Building Services installations,
without any other contributions.
All noise levels quoted are applicable when Base
Building plant is running under normal operation
only, i.e. not under emergency operation.
The maximum noise criteria from the Base
Building services installations for other areas
are as follows:
Means of Escape
Means of escape is designed on the basis
of one person per 6m2 for office floors and
based on the area covered by the Category A
Specification Works.
Criteria for Plant Noise Transfer to Internal Areas
The staircases are designed for simultaneous
evacuation of all floors in the case of normal
office occupancies.
Tenant/Area
Noise Criterion
Ventilation Systems Serving Actual Area
All Other Systems
Open plan offices
NR38
NR33
Fire Separation
Structure and enclosures for specific areas have
been designed with the following fire resistance:
Structure above ground floor (except roof)
1hr
Escape cores
1hr
Lower ground, basement and
ground floor structure
1hr
Circulation areas/lobby
NR40
Toilets
NR45NR40
NR35
Retail stores
NR45
NR40
Service areas
NR55
NR50
Plant roomsTo suite adjacent areas (see above)
Retail1hr
EDF room
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 4hrs
3 3 d av ie s s t r e e t 2 1
Architectural Summary Specification
Sanitary Provision
Notes
Male Toilets
Number of sanitary fittings taken from
BS6465:Part 1:2006 A 2009 Table 4.
12m²/Person, 60:60 Male:Female
The three WC’s and three basins provide for
16-30 persons, male or female.
Floor
Office Area
Occupancy
No. of Males
Male
Male
Male
(m²)
@ 12m²/Person
(60%)
WC's
Urinals
Basins
First
539
45
27303
Second
558
47
28303
Third
558
47
28303
Fourth
558
47
28303
Fifth
473
39
23303
Female Toilets
12m²/Person, 60:60 Male:Female
Floor
Office Area
Occupancy No. of Females
Female
Female
(m²)
@ 12m²/Person
(60%)
WC's
Basins
First539 45 27
3
3
Second558
56
28
3
3
Third558 56 28
3
3
Fourth558
56
28
3
3
Fifth473 39 23
3
3
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 2 2
Structure
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 2 3
Structure
Substructure
Superstructure
Loading Criteria
The new basement slab is a reinforced concrete
raft and distributes the building loads to the
London Clay below.
The superstructure generally consists of a steel
frame with composite reinforced concrete slabs
supported on permanent metal formwork. Stability
is provided by the reinforced concrete lift and stair
cores acting as cantilevers from the raft slab. Wind
loads are transferred to the cores via diaphragm
action of the composite floor slab.
Structural provisions will be made to correspond
with the requirements of the final plant
replacement strategy.
The waterproofing system for the basement
has been designed to the equivalent of Grade
3 in accordance with BS 8102:2009:Table 2. In
addition to external tanking the basement raft
and perimeter concrete walls have been designed
and detailed to BS8007 (Code of Practice for
Design of Concrete Structures for Retaining
Aqueous Liquids).
Foundation Settlement
Settlements, differential settlements, heave
and lateral movement will be limited so that
the building construction and finishes are not
compromised. The minimum performance criteria
for foundations shall result in a residual 10mm
(maximum) total long term settlement and 5mm
differential movement between adjacent columns.
Differential settlement between horizontal has
been designed not to exceed a 1:500 gradient.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t The office floors have been designed so that the
magnitude of the floor vibrations will generally
be limited to a Response factor of 8 as defined
by SCI Publication P354 in all areas. The natural
frequency of elements of the floor will not be less
than 4Hz.
Vibration shall not exceed the levels defined for
offices in table 5 of BS6472 with reference to the
base curve in figure 2.
Internally, fire protection to steelwork is provided
by intumescent coating.
Steelwork will be minimum grade S355.
The floor slabs are generally designed to
accommodate the following uniform live
loads (kN/m2):
Area kN/m²
Design Partition
LoadLoad
Office
3.51.0
Retail
5.01.0
Storage areas
7.5
Circulation/toilet cores
4.0
Basement plant
7.5
Roof plant
4.0
Roof maintenance access
Highway surcharge
1.5
10.0
Deflections
The deflection of floor elements due to imposed
loads will be limited to the lesser of span/360
or 30mm under full-imposed load. The pre-cast
concrete building façade is supported off the
building columns therefore; the edge beams have
not been designed to different criteria.
On every office floor a 1.5m zone located around
the stair cores is designed to accommodate an
uplifted uniform live load of 7.5kN/m² together
with a reduced floor live load of 2.5+1.0kN/m² to
the remainder.
Dead loads will be subject to chosen structural
design details plus an allowance of 0.85kN/m² for
ceiling, services and raised floors.
3 3 d av ie s s t r e e t 2 4
Structure
Loading Criteria cont’d
Design Standards
Structural design is in accordance with relevant
British Standards current at Building Control
submission. Where a standard does not exist due
consideration will be given to use standards of
other countries making sure that they are suitable
for the particular application. In the event of
variation the appropriate standard should apply.
Tolerances
Office floors will be finished exposed concrete
to accept raised flooring with tolerances
complying with the National Structural Steelwork
Specification for Building Construction (3rd
edition) and National Structural Concrete
Specification for Building Construction
(2nd edition) as amended by relevant
Ramboll specifications.
Fire Resistance
Structural elements have the degree of fire
protection appropriate to their location and
not conflict with finishes specified elsewhere. In
principle a one hour fire protection is required to
all the elements, except for the areas of the roof
not forming part of a stability system which do not
require fire protection or the basement which will
require a two hour fire rating.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Concrete Generally
Fire resistance for concrete elements is inherent
to the material and no additional protection
is required.
Concrete strength is RC40 to the basement
construction and RC35 to the suspended
composite concrete slabs.
Intumescent paint or alternative systems will need
to be applied to steelwork elements requiring
fire protection.
All reinforcement bars and mesh to have a
minimum yield strength of 460N/mm2.
External grade intumescent paint to be applied
to externally exposed structural steelwork.
(For comprehensive structural fire protection,
refer to structural fire report from SAFE SAFC0030-FS-005-RB).
Corrosion Protection
Cover to reinforcement has been determined in
accordance with BS 8500 depending on location
to prevent corrosion. Typically, cover to basement
elements is 40mm and 30mm to superstructure
elements. Cover to faces of elements in contact
with the ground to be a minimum of 50mm. The
recommended concrete class for concrete in
contact with ground is AC-2 (based on table 2 of
BRE Special Digest 1 Part 1, 2001).
Tolerances
Placing of the concrete shall be within the range
of deviation normally achievable for construction,
as detailed in BS 5606:1990, except that no point
or surface above ground shall deviate from its
nominal position or level by more than 20mm.
Steelwork fabrication and erection tolerances
to be in accordance with the National Structural
Steelwork Specification (3rd edition) as amended
by the Ramboll Steelwork specification.
Public Health/Below Ground Drainage
All below ground drainage designed and installed
in accordance with The Building Regulations Part
H1, inclusive of all current amendments, BS EN 752:
2008 and BS EN 12056 (all sections).
All structural steel elements shot-blasted to Sa2½
and have the degree of protection appropriate to
their location in both temporary and permanent
exposure conditions to ensure adequate durability
throughout the life of the structure.
3 3 d av ie s s t r e e t 2 5
Building Services Outline Specification
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 2 6
Building Services Outline Specification
Building Services
Design Criteria
Introduction
The new development is provided with a full
Mechanical, Electrical, Public Health and Vertical
Transportation services installation.
The building offers the following flexibility
features and provisions for the incoming tenants’
future use:
The services are designed and specified to meet
an established level of fit-out standards.
•Plant space on the roof for future tenant plant
The services are designed in accordance with all
relevant standards, current building regulations
and recognise established benchmarking in
respect to good engineering practice such as BCO,
CIBSE and British Standards.
•Spare connections on the air conditioning system
to install additional fan coil units on the floors
The design criteria for the new development
follows the recommendations of CIBSE and The
British Council for Offices (BCO), as described
in the 2009 Guide to Specification, and as
noted below.
•Openable windows for additional fresh air
•Spare louvres or spare space in louvres on both
sides of the courtyard for the installation of
additional fresh air fans or extract from a tea
point, shower or small kitchen
Mechanical
The services are designed in accordance with
the requirements of BREEAM 2008 to achieve
an ‘Excellent’ rating for the office building. Green
technologies, such as photovoltaic arrays, and
energy efficient design measures are employed to
reduce CO2 emissions to meet the requirements
of Part L 2010 of the Building Regulations and
achieve an EPC rating of 40 or less.
•Additional allowance in the building electrical
supply infrastructure
•Summer: 30°C db, 20°C wb
The building is designed to incorporate plant
rooms within the basement and roof areas. The
plant is located to optimise the distribution
routes and provide good access for maintenance
purposes. Services distribution is by means of
dedicated vertical risers. Risers are incorporated
within the structural constraints of the building to
ensure servicing zones are kept to a minimum.
The building provides the incoming tenants with
a high level of flexibility to facilitate incorporating
the requirements of their Category B fit-out
without the need for major works.
In addition to the base build servicing strategies,
provisions are made for future tenants’ servicing
requirements. Space is provided on the roof
and in the risers for potential future tenants’
DX condensers and pipework, tea point services
and showers.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t •Capped services provisions in both risers to
accommodate a tea point, a shower or both
•Upgraded services connections in the south
riser on the fifth floor to accommodate a full
catering kitchen
External Temperatures
•Winter: -4°C saturated
•For heat rejection plant: 35°C db
Internal Temperatures
Open plan:
•Summer: 24°C +/–2°C (i.e. in cooling mode, the
system shall cool the space to this temperature)
•Winter: 20°C +/–2°C (i.e. in heating mode, the
system shall heat the space to this temperature)
Office reception/building manager’s office:
•Summer: 24°C +/–2°C (i.e. in cooling mode, the
system shall cool the space to this temperature)
•Winter: 20°C +/–2°C (i.e. in heating mode, the
system shall heat the space to this temperature)
•Office toilets/changing room: 19°C min
•Corridors/staircases: 19°C min
•Occupancy: 1 person/10m2
3 3 d av ie s s t r e e t 2 7
Building Services Outline Specification
Design Criteria, cont’d
Mechanical cont’d
Electrical
Public Health
Heat Gains
Load Densities
•Occupancy: 90W sensible/50W latent
•Tenant small power provision: 25W/m
•Lighting: 12W/m2
•Tenant small power additional allowance:
75W/m2 on any one floor
Fresh Air Ventilation Rates
•Tenant mechanical services provision: 60W/m2
•Office open plan: 12 l/s per person + 10%
additional allowance for meeting rooms/areas
of high occupation density. This equates to 12
l/s per person at an occupation density of 1
person/9m2
•Overall raised floor finish zone of 100mm with
64mm void
The public health services design take due
account of all current relevant British Standards,
the requirements and Regulations of Local
Authorities and the recommendations, insofar as
they apply to this project, concerning the control
of Legionella Pneumophila as contained within the
CIBSE TM13 2000 document and the Health and
Safety Commission Guidance Booklet L8 formerly
HS (G) 70.
Illumination Levels
Population Density
•Office toilets: Transfer from adjacent office space
•Tenanted demise office 350-450 lux at the
working plane
1 person per 10m2
•Changing room: 10 a/c per hour
•Toilets: 150-200 lux at floor level
•Cleaner’s cupboard: None
•Lift Lobbies: 150-200 lux at floor level
•Corridors/lobbies: None
•Stairs: 150-200 lux at landing floor level (70 lux
minimum at centre tread)
60/60 throughout
Cold Water Storage
•Office toilets/showers: 12 a/c per hour
•Entrance: Lobby Special feature lighting to
architectural requirements
•Cleaner’s cupboard: 6 a/c per hour
•Common areas: 100-150 lux at floor level
•Small power: 25W/m
2
Extract Ventilation Rates
•Corridors/lobbies: None
Noise Levels
2
•Tenant lighting provision: 12W/m2
Fire Alarm
To BS 5839 – L2
•Open plan offices: NR40
•Speculative offices: NR38
Emergency Lighting
•Cellular offices: NR35
To BS 5266
Male/Female Split
Offices = 20 litres per person based on a half
day storage. The domestic cold water system
are designed and arranged so that no stagnation
occurs, and adequate backflow protection is
provided to meet the requirements of the Water
Supply (Water Fittings) Regulations 1999.
Hot Water Provision
Local unvented storage cylinders.
Lightning Protection
To BS EN 62305 and BS 7430
Small Power Installation
Tenant’s Tea Points
Connections available at each core on soil, vent
and cold water risers for extension by tenant.
17th edition BS7671
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 2 8
Building Services Outline Specification
Design Criteria, cont’d
Mechanical Services Description
Public Health cont’d
Heating and Cooling
Tenant’s Showers
Each office tenant’s space is heated and cooled
using a high COP heat recovery VRF system. The
system is capable of simultaneously heating and
cooling individual spaces as required. Ducted
concealed indoor units are located in the ceiling
void to serve perimeter and internal zones as
per the BCO guidelines. Around the perimeter of
the building, one indoor unit is provided for each
notional 6.0mx4.5m office module while for the
internal areas, one indoor unit is provided to serve
a maximum zone area of 70m².
Connections available at each core on soil, vent
and cold water risers for extension by tenant
Tenant’s Kitchen
Connections available in the south core on the
fifth floor on soil, vent and cold water riser for
extension by tenant.
Surface Water
Roof drainage is be designed in accordance with
BS EN 12056 2000 and Building Regulation ‘H’
utilizing roof outlets. All rainwater outlets and
pipe sizing is based upon a storm intensity of
0.030 litres/second/m² to suit the existing building
infrastructure capacities.
Pipe Sizing
Pipe sizing of the hot and cold-water
distribution systems is carried out using the
‘Loading Unit’ method.
Soil and Waste
Soil and wastewater sanitary pipework is designed
and installed in accordance with BS EN 12056
2000 and Building Regulation ‘H’. The systems are
designed as a fully ventilated single stack system.
All pipe sizing is carried out using the ‘Discharge
Unit’ method.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Heat from the VRF systems is rejected via air
cooled condensers located within the louvred
plant enclosures at roof level. Each tenant’s space
independent VRF system is fed, electrically, from
the corresponding tenant’s distribution board
providing the facility of direct billing. Each air
cooled condenser is connected to the indoor units
via refrigerant pipework mounted on dedicated
trays and routed vertically through the building
inside the two main risers. On the floors, pipework
is distributed to the indoor units by means of
master and slave ‘BC’ zone controllers provided
with spare ways to allow the tenant to add indoor
units to suit the fit-out requirements.
A centralised system controller, one per tenant’s
space, is located within the tenant’s riser and is
capable of controlling the indoor units individually
or as a group. The controller is also connected
to the central BMS and have the capability to
be networked to other controllers should a
future tenant occupy more than one floor or the
whole building.
The indoor units supply tempered air under the
dictates of return air temperature sensors at the
rear of each indoor unit. A 5 metre coiled control
cable is provided at each indoor unit to allow
the tenant to extend the space control to a wall
mounted temperature sensor if required.
Linear diffusers and associated pre-insulated
plenums are installed around the perimeter of
each floor with swirl type ceiling diffusers located
within the internal ceiling grid. The indoor units
are connected to the new plenums/diffusers with
thermally insulated rigid sheet metal ductwork,
complete with volume control dampers. The final
connection to the diffuser plenum comprises
a straight pre-insulated flexible duct, which
is no more than 500mm long. Return air is
drawn into the ceiling void via a combination of
return air sections in the linear diffusers and air
handling luminaires.
Plant and riser space is provided for each office
tenant to install any future condensers needed for
a server room or to increase their system capacity
to 100W/m² of small power cooling allowance
in the case of a trading operation on one floor.
Dedicated and labelled trays for the future
pipework installation are provided in the two
main risers.
The toilets on each floor are provided with
domestic hot water via an unvented storage
cylinder served by a VRF heat pump boiler,
connected to the office floor VRF system slave
BC controller.
3 3 d av ie s s t r e e t 2 9
Building Services Outline Specification
Mechanical Services, cont’d
Controls Services Description
Ventilation
Each office space is provided with a dedicated
mechanical fresh air supply and extract system
with heat recovery. The fan located above the
ceiling in the toilet core comprises fan sections,
motorised shut off dampers, an electric heater
battery and filter banks. The fan is connected to
intake and discharge louvres in the back façade by
means of thermally insulated ductwork. Fresh air
is heated to a temperature of 14°C and distributed
from the fan through galvanised sheet steel
ductwork to the back of the indoor units. Air is
extracted from the occupied space by using the
ceiling void as a return air plenum via air handling
luminaires and dummy sections in the linear
diffusers located within the suspended ceiling.
Silencers are provided on the intake and discharge
ductwork to both fan sections. The silencers
comply with the requirements of the acoustic
consultant’s specification. Ductwork between the
fans and the louvres is acoustically lined.
Mechanical toilet extract ventilation is provided for
the landlord’s toilets and showers/changing room
using a dedicated twin fan. Extract from each
toilet/shower is achieved by way of circular extract
valves in the ceiling connected to a ductwork
riser. The riser collect the toilet extract air from
the different floors and connect to the fan located
inside the north enclosure at roof level.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t The toilet extract fan is controlled under the
dictates of a time clock through the BMS. Power
to the fan is provided from a landlord’s distribution
board. Silencers is provided on the intake and
discharge ductwork to the toilet extract fan.
Make-up air is provided from the adjacent
office spaces ceiling void via transfer ducts
complete with cross talk attenuators. The transfer
ducts connect to supply grilles located in the
toilet ceiling.
Supply air to the changing room in the basement
is provided by means of the fresh air supply fan
located in the back of house corridor serving the
basement areas. At the central plant the air is
heated to a temperature of 18°C.
The refuse and plant room areas are provided with
dedicated extract fans located within the spaces
and discharging to the outside via an extract
louvre located in the first floor lightwell.
Silencers are provided on the intake and discharge
ductwork to each of the above supply and extract
fans. The silencers comply with the requirements
of the acoustic consultant’s specification.
Control of the building systems is provided by
a direct digital control (DDC) system, including
a head end management station, network
controllers and DDC units. All control algorithms,
computation and energy management functions
is software-based and resident in the DDC system.
The operator has the capability through the head
end or network controllers to access all programs,
display all data resident in the system memory and
perform analogue and digital functions.
All fans, pumps and other similar drives is variable
speed drives. Simultaneous enabling of drives
is prevented by a sequential start program in
the DDC system. This program also provides
sequential restart after failure of drives that
were running prior to power failure or fire alarm
shutdown. Software time delay relays is provided
in the DDC system to allow fan motors to cool
down before restarting. Motors have both a
minimum interval time (between consecutive
starts) and a minimum off time (between start
and stop). The time periods is based on the
motor rating.
In the event of a fire alarm condition the BMS
receives a signal from the fire alarm system which
shuts down all HVAC systems. Automatic restart of
fans after a fire alarm or power failure shutdown is
software prohibited through the de-energisation
of the remote start/stop contact. Fan restart is
manually initiated by the operator either locally
or remotely through the head end.
3 3 d av ie s s t r e e t 3 0
Building Services Outline Specification
Controls Services, cont’d
Electrical Services Description
Incoming Electrical Services
A Trend IQ3 building management system (BMS)
is installed. The BMS consists of Trend IQ3 ‘web
enabled’ outstations for the landlord’s plant and
each tenanted area. The outstations is networked
together with a dedicated TCP/IP BMS network.
A Trend 963 head end supervisor is installed in
the main reception. This acts as a central point of
integration for the landlord’s and tenants’ plant
and colour graphics is provided for each item of
plant. All alarms is sent to the BMS head end.
On the office floors, a Trend IQ3/XNC web
enabled outstation is provided for each tenanted
space. A dedicated control panel is provided in
each tenant’s riser to control/monitor the primary
ventilation system, the VRF heating/cooling
system and the electrical metering. Each control
panel/outstation also has 25% spare capacity
to enable the incoming tenant to add his own
services such as comms room cooling equipment
etc. Each control panel comprises a Mitsubishi
AG150 LCD touch screen intelligent controller and
power supply, a Trend IQ3/XNC outstation and
power isolation. Each control panel has 20m of
coiled control cabling and a stainless steel cover
plate with an audible and visual alarm. If required,
the cover plate is extended by the tenant to his
reception desk to notify of a common alarm from
the Trend IQ3/XNC controller.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Each control panel also has a facia mounted plant
extension button allowing the tenant to extend
the operation of the VRF and ventilation systems
for a further two hours after normal operation.
Each time the button is pressed the systems
operate for a two hour period even if pressed
midway through a previous operation. A fire
alarm interface is provided adjacent to each
control panel. On receipt of a fire signal the plant
is shutdown.
The web enabled facilities on the AG150
controllers and Trend IQ3/XNC outstations
provide the tenants with a facility to web browse
their plant via a TCP/IP connection should they
wish to as part of their fit-out plans. Should a
tenant occupy more than one floor, he is able to
web browse all controllers/outstations from a
central point or consider a central PC to monitor
the systems.
A new substation is provided at basement level
of the south building elevation, in line with UKPN
design considerations and requirements. The
new incoming supply will service landlords and
tenants’ Low Voltage (LV) switchgear to distribute
to lighting, small power, mechanical plant, lifts
and associated systems. The landlord switchgear
comprises a main form 4 type 5 method of
construction LV switchboard, located within a
dedicated landlord switch room at basement level.
The landlord’s switchboard is provided with
space allocation for automatic change over
arrangements for the incoming services. Provision
of the changeover arrangements, associated
controls, wiring and connections shall be by the
tenant’s fit-out team.
All tenants’ IQ3/XNC controllers is linked to the
head end located at the reception desk on the
ground floor. This allows the building manager
to monitor and control all features of the tenants’
plant and display colour graphics for each item
of the plant.
3 3 d av ie s s t r e e t 3 1
Building Services Outline Specification
Electrical Services, cont’d
Sub-Main Electrical Distribution
The main distribution arrangements originate from
the dedicated landlord main Low Voltage main
switch board. Spare ways are provided to allow
for future flexibility. Power factor correction is be
provided on a distributed basis with each piece
of plant provided with suitably sized correction
capacitance. Additional power factor correction
is provided on a bulk basis together with
surge suppression as part of the landlord main
switchboard arrangements.
Space provision has been made at roof level for
future tenant plant. In addition, space provision is
provided through the distribution system to allow
for associated future cabling.
The electrical distribution system comprises
sub-main boards for landlord’s distribution of
final sub circuits. Landlord distribution boards
are located within landlord accessible areas only.
Motor control is arranged on a distributed basis,
negating the requirement for large motor control
centres. A system of rising cable mains within
each tenant electrical riser is provided, allowing
single tenancy occupation across each office floor.
Rising cable mains have been provided, suitably
sized, for the connection of tenant composite
distribution panels within each tenancy demise.
Each tenant floor service is independently utility
meter operated. The utility meters are located
centrally within the main landlord LV switch room
at basement level.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Each tenant’s demise is provided with a composite
lighting and small power distribution panel to
serve the tenant’s on floor electrical requirements.
The panel is located within the risers at each floor
and incorporates electrical energy (electronic)
multi-meters. The metering arrangements are
provided with pulsed output terminals for
central meter reading via the BMS. The building
electrical energy metering and monitoring systems
are provided in a manner compliant with the
requirements of Building Regulations Part L 2010.
A dedicated earthing distribution system is
provided to meet BS7671, with additional tenant
riser earth bars for tenant services. A lightning
protection system is provided comprising roof
earth termination network and utilising the internal
building structure for down paths and finally
terminating at basement earth rods.
No tenant specific under floor small power
provision is provided as part of the base building
works. Raised access flooring is provided as part
of the architectural package of works and allows
a clear void for future tenant power distribution
requirements. The voids are maintained clear of
all other landlord services to ensure maximum
tenant flexibility. The base building distribution
network arrangements are suitably sized to allow
capacity for anticipated future tenant small power
arrangements based upon BCO recommendations.
Local cleaner’s sockets are provided at strategic
points within the core and common areas,
serviced from local landlord distribution boards.
The landlord distribution boards also provide
local power circuitry for toilet areas, and other
miscellaneous services. Additional sockets are
provided within the tenanted demise for cleaning
purposes and supplied from the respective floor
tenant distribution panels, these cleaners sockets
are mounted flush within the raised floor utilising
a cleaner’s hive type arrangement to allow
maximum flexibility to the tenant’s Category B
fit-out.
High level power is provided within the tenant
demise areas on each floor to serve the on floor
mechanical systems and controllers. Each item
of tenant mechanical plant is serviced from
the composite tenant riser distribution panels,
cabling is terminated locally within the ceiling
void at a suitable isolation device. Ceiling void
wiring arrangements comprise a prewired plug
in distribution arrangement, providing maximum
flexibility and speed to future tenant fit-out works
and subsequent tenant alterations.
The main building entrance hall is provided
with a landlord distribution board which
provides sub-circuitry to support local power,
mechanical services, lighting and main reception
desk facilities. Services to the reception desk
incorporate strategic building control panels,
reception lighting controls, over door heater
controls and localised task lighting.
3 3 d av ie s s t r e e t 3 2
Building Services Outline Specification
Electrical Services, cont’d
Lighting, and Lighting Controls
Office area lighting is provided generally meeting
the intent of the recommendations within CIBSE
Lighting Guide 7. Luminaires are low glare and
high efficiency and complete with high efficacy
lamp technology.
All fluorescent luminaires include high frequency
‘DALI’ dimmable ballast control gear with
integrated power factor correction to a minimum
of 0.95 lagging.
The overall lighting arrangements through
the property have been selected to meet the
requirements for compliance with part L of the
Building Regulations 2010 Luminaires therefore
meet the criterion of providing a minimum of 55
luminaire lumens per watt (LL/W) efficacy. Further
lighting energy efficiencies have been provided
to ensure full building wide compliance with
building regulations.
Luminaires are installed within the architectural
accessible 750x750 ceiling arrangements in a
regular pattern and provide even illumination
throughout the space, and maximise future
tenant flexibility.
All external lighting is photocell controlled with
automatic time clock control override to switch
off luminaires between 2300hrs and 0700hrs.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Emergency lighting system to suit the needs of
BS 5266 is provided throughout both tenanted
demised areas and common areas, via integral
conversion packs.
Multi-port Lighting control marshalling boxes
(LCM) are installed within the accessible ceiling
voids to suit the needs of the Category A lighting
arrangement, with integrated intelligence to allow
for future reprogramming to suit a Category B
tenant fit-out. Spare ports have been left at the
marshalling boxes to allow for additional future
tenant flexibility. The lighting control arrangements
are initially set up to provide passive infra-red PIR
presence detection with overall time scheduling
allowing for out of normal working hours
operation (one hour run on period). The system
is programmed to minimise energy wastage due
to luminaire activation when the offices demises
are unoccupied.
Additionally, the system is further enhanced with
daylight linking sensors. These sensors form
an integral part of the PIR detector heads to
automatically decrease luminaire output, via their
dimmable control gear, when natural illumination
via the perimeter glazing is maintaining the
required ambient illumination levels.
Lighting control and ambient lighting detection is
provided throughout the office demise floor plates
for daylight harvesting over the complete demise.
The lighting controls arrangements are arranged
to function on a floor by floor basis, with facility
to extend the system with a wired backbone to a
central head end at the main building reception.
It remains the tenant’s responsibility to modify the
arrangements to suit his specific requirements.
The lighting control system is based upon a plug
and play methodology and is fully intelligent and
programmable thus allows maximum flexibility to
the tenants.
General common areas lighting arrangements are
provided to the core areas to suit the architectural
design and the requirements of Part L 2010 of the
Building Regulations.
Toilet lighting and staircases are passive infra‑red
controlled, thus reducing energy usage, with
daylight linking where glazed windows are
available. All other areas are locally controlled via
PIR switches as necessary.
Staircase core lighting control is PIR controlled via
din real mounted LCM modules mounted within
the risers.
3 3 d av ie s s t r e e t 3 3
Building Services Outline Specification
Electrical Services, cont’d
Fire Alarm Services
A new fire alarm installation is provided
throughout the office, with automatic detection
coverage to L2 as defined in BS5839. The
system is based upon an addressable analogue
type arrangement.
The fire alarm system comprises automatic smoke
detection or where appropriate heat detection
with combined sounder bases. Tenant demises
are provided with a loop in interface connection
to allow extension of the system for their bespoke
Category B fit-out works.
The system is interfaced with items of mechanical
plant to ensure shut down in the event of alarm.
Lifts are also interfaced to ensure grounding to
the lowest non alarmed floor above basement.
Smoke detector units are provided with integrated
Xenon strobe visual indication located strategically
within the tenant office demise areas to ensure
a fully DDA compliant fire alarm installation.
Security
CCTV System
A system of landlords CCTV monitoring is
provided throughout the building with coverage
extending to main access routes for egress and
exit of the development. Cameras, where internal
are Colour High resolution with CCD sensor.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t External CCTV cameras are night vision type
IP66 and vandal resistant. All CCTV units are fixed
head type only, with dome type housings with
mounting brackets.
CCTV coverage is provided to the following areas:
Access control is provided to the following areas:
•Basement lift lobby
•Refuse store
•Bicycle parking
•Changing room
•Internal access to retail units (basement)
•Ground floor reception core doors
•External exits at ground floor
•Grosvenor St service entrance
•Reception hall
•Three Kings Yard service entrance
•Internal rear access to retail units (ground)
•Egress doors to office floors
•Passenger and goods lift cars
The system is centrally monitored at the building
manager’s office at ground floor. The building
manager’s office also houses the associated colour
monitors and digital recording equipment.
In additional to security access control addition
door monitoring contacts are provided to each
of the above areas and in addition:
•Basement retail rear access doors
•Ground floor retail rear access doors
Recording is digital onto a hard drive devices
sized to allow a minimum of 30 days recording to
be stored.
•Roof core access
A system of security wiring carcassing and
containment is provided to allow the future
provision of CCTV and access control to the tenant
demises. The CCTV and access control system
installation is part of the tenant fit-out.
Separate basic intruder alarm systems are
installed to the office development and monitor
all ground floor and basement floor common parts
access doors against forced entry, by means of
door contacts.
Access Control System
Swipe/proximity access control readers are
provided at defined base building positions
to maintain secure monitored access to
landlord areas.
Intruder Alarm System
All ground floor windows also have vibration
sensors linked back to the main access control
panels, excluding those associated with the retail
units which remain without sensors.
A security containment system is installed through
the commercial office accommodation electrical
risers to enable future installation of a security
system by incoming tenants.
3 3 d av ie s s t r e e t 3 4
Building Services Outline Specification
Electrical Services, cont’d
Public Health Services Description
Disabled Persons Alarm/Communication
IT Services
Cold Water Systems
Disabled alarm systems are provided within each
disabled person toilet with local indication and
alarm. The system is capable of being extended to
provide a central monitoring point.
To allow each of the future tenants to provide
their own communication requirement as part
of their fit-out works a new incoming service
frame room is incorporated into the design at
Basement level inclusive of incoming service ducts
terminating at the entry points of the building with
puddle flanges.
A complete drinking water distribution system
is provided to supply water to all fixtures,
water consuming equipment, hot water heating
equipment, and valved outlets for future office and
retail tenants’ use is provided. The metered office
development supply is supplied from the Thames
Water main in Davies Street. A new basement twocompartment cold water storage tank complying
with regulation 16 of the Water Supply (Water
Fittings) regulations 1999 is provided to serve the
office development complete with division plate,
overflows/warning pipes, air vents etc.
In addition a system of ambulant disabled refuge
call and communication is provided with central
communication monitoring to the building
manager’s office. Two way communications
between each communication station and the
head end panel are provided to allow fire brigade
communication with each disabled person
refuge location.
Photovoltaics
Part L 2010 of the building regulations imposes
restrictions and requirements to minimise the
carbon footprint of the development. Taken as a
whole it is necessary to provide some sustainable
technologies to offset some of the energy usage.
The PV arrays are provided with inverter units
locally at roof level incorporated within IP rated
enclosures and generate electrical power supplied
back into the landlord distribution arrangement
from the local distribution board connections.
Import and export meters are provided so that
any excess energy not utilised by the landlord
electrical systems shall be exported back to the
electricity utility supply.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t A primary cable tray containment route is
provided from the frame room to each floor via
the electrical service riser. In this way tenant
flexibility is met. Additional space allowance is
made within the riser for the future installation
by tenants of dedicated containment for their
bespoke and secure IT requirements. All tenant
IT and communication systems and wiring shall
be part of the tenant fit-out works.
The water supply to the office cold water storage
tank is pre-filtered and treated via a UV steriliser.
Electrically operated solenoid valves are provided
on the main cold water supply to each section of
the cold water storage tank. These shut off the
supply to the tank upon receipt of a signal from
the high water level sensors located within the
tank. An electrically operated solenoid valve is also
installed on the mains cold water supply directly
downstream of the meter. This shuts the supply
to the building upon receipt of a signal from the
tank room leak detection tape. The solenoid valve
activates an alarm when in the closed position and
is monitored by the BMS. The solenoid valve is also
provided with a facility for enabling manual reset.
3 3 d av ie s s t r e e t 3 5
Building Services Outline Specification
Public Health Services, cont’d
Cold Water Systems, cont’d
Hot Water Systems
Foul Water Drainage
A new variable speed booster set takes suction
from the water storage tank and supplies the
office water requirements. The drinking water
fixtures are served directly from the boosted
system. The cold water fixtures are served via a
double check valve arrangement from the boosted
system. Pressure reducing valves are provided
at every floor level to maintain a balanced
equilibrium of outlet pressures.
The hot water requirements for the office toilets
are generated from localised unvented hot water
storage cylinders. Hot water storage is set at 60°C.
Hot water distribution pipework is traced heated
to maintain the hot water temperature utilising
self-regulating tape suitable for repeated long
term performance. Hot water for future office
tenants’ requirements is provided by the tenant’s
own local hot water heaters.
At each floor level a sanitary shut off valve is
provided on the main branch cold water supply
serving the toilet core. The valve is linked to PIR
sensors located above the entrances to the male
and female toilets. These valves isolate the supply
to the toilet core during periods of no use. The
PIRs and solenoid valves are served from the
maintained live lighting circuits. Thermostatic
mixing valves are provided on the water supplies
serving the wash hand basins. Automatic spray
taps are utilised on all wash hand basins, therefore
providing a saving on water consumption for hand
washing of approximately 66% when compared
with flows from conventional taps. This also
provides an energy saving by reducing the hot
water consumption. Systems are installed in
copper pipework, with capillary joints and fittings.
All pipework is insulated except where on view,
adjacent to sanitary fittings, where it is chrome
plated. Local ballofix isolation valves are fitted on
all appliances.
Automatic spray taps are utilised on all wash hand
basins, therefore providing a saving on water
consumption for hand washing of approximately
66% when compared with flows from conventional
taps. These also provide an energy saving by
reducing the hot water consumption. All wash
hand basins are fitted with individual D08/TMV3
approved thermostatic mixing valves located
directly under each sanitary appliance and set
at 43°C.
A fully ventilated soil and waste pipework system
is provided to collect the discharge from the foul
and waste fixtures within the building. Drainage
from ground floor and above is achieved by
gravity. All soil and waste systems combine at high
level basement and connect to the new buried
drainage system before discharging into the new
sewer outfall. The soil and waste system comprises
of a number of fully ventilated single vertical
cast iron soil and waste stacks terminating above
roof level to atmosphere. Connections to these
soil and waste stacks are incorporated to collect
discharges from sanitary appliances via local range
pipework. Ventilation of appliance traps and waste
pipes is also provided to ensure against loss of
trap seals. In all areas, the drainage pipework is
accessible. Access is provided at all changes of
direction and at every floor level as a minimum.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t The new hot water systems is installed in copper
pipework, with capillary joints and fittings. All
pipework is insulated except where on view,
adjacent to sanitary fittings, where it is chrome
plated. Local ballofix isolation valves are fitted on
all appliances.
Future office tenants’ tea point and shower
facilities are provided with capped waste branch
connections together with capped anti-siphon
pipes for extension by the tenant.
It is necessary to collect and pump the soil and
waste products from the basement sanitary
fittings, retail drainage points and the tank room
floor drainage into the high level suspended
gravity drainage systems.
3 3 d av ie s s t r e e t 3 6
Building Services Outline Specification
Public Health Services, cont’d
Vertical Transportation Services
Surface Water Drainage
Introduction
A system of outlets and down pipes is provided to
drain all roof areas. All rainwater pipes are located
in accessible positions for future maintenance.
Rainwater gutters are provided with a provision
for overflow to protect the building fabric should
the design rainfall intensity be exceeded and
also to indicate blockage. Rainwater pipes are
generally located in main riser ducts, plant rooms
and ceiling voids.
Two 14 person, 1000kg, general purpose
passenger lifts serving all floors and one 26
person, 2000kg, passenger service lift serving
basement and ground floor levels, are provided to
serve the building.
Access is provided at all changes of direction
and at every other floor level as a minimum. Rain
water pipes connect into the high level basement
drainage system via running traps prior to
connection to the sewer outfall intercepting trap.
WC Overflows
WC flushing cisterns are to comply with The
Water Supply (Water Fittings) Regulations 1999
and incorporate internal overflows that discharge
water via the flush pipe.
All equipment complies with the standards of
materials and workmanship detailed in the British
Council of Offices guide and is suitable for a
prestigious office building. The works undertaken
comply with all necessary standards and
regulations; in particular, the Health and Safety
at Work Act 1974, EN81, BS7255, BS5588 where
applicable, BS8300, The Lift Regulations, Lifting
Operations and Lifting Equipment Regulations
1998, The Machinery Regulations and good
working practice.
Details of Lift Car Finishes
Passenger Lift Car Finishes
General: Bespoke finishes include emperador
stone floor, leather wall panelling, full height mirror
with walnut frame, and bronze doors and trim.
Ceiling: Powder coated metal with low energy
fluorescent downlighters or super LED’s. One lift is
to have a demountable ceiling to enable partitions
to be transported. Additional lighting is provided
above the ceiling.
Handrails/bumper rails: 50mm bronze rails
Drapes: Required
Emergency lighting: Provided to operate from
Nickel Cadmium batteries rechargeable – three
hour duration.
Control panel finish: Bronze to be located in the
side walls 400mm from the front wall.
Control panel features: Flush in the side wall
with tactile markings, incorporating all floor
pushes with call accepted signals door open and
close pushes, car light and service key switches,
emergency intercoms, position and overload
indicators. The floor pushes is within 900-1200mm
height. Enunciators are to be provided. Provision
is to be made for car reader security system to
restrict access.
Car position indicators: Modern digital white
LCD type.
Lighting switch: Key operated in lift cars.
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 3 7
Building Services Outline Specification
Vertical Transportation Services, cont’d
Details of Lift Car Finishes, cont’d
Ventilation: Visible high and low level natural
ventilation with profile cut vents and backing
plates with a maintained emergency extract fan.
Fan: Battery operated silent fan operated by a
thermostat mounted within the lift car ceiling.
Overload indicator: Required
Car preference: Required
Emergency systems: Windcrest intercom, alarm
and emergency breakdown telephone system
with autodial to internal system and then external
breakdown service. Inductive loops are to be
provided for persons with impaired hearing.
Car doors: Two panel centre opening doors
in bronze.
Entrance protection: Full height non contact multi
beam detectors.
Advance door opening: No
Landing Furniture
Position indicators: Modern digital white LCD
required all floors.
Pre-announcing direction indicators: Required at
all floors.
Landing stations: One riser with tactile markings
and white call accepted signals.
Landing entrances: Two panel centre opening
finished in satin stainless steel
Fire rating: Two hours required
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Architraves: Required
Type: Small frame
Finish: Bronze
Sills: Aluminium
Passenger Service Lift Car (Goods lift) Finishes
General: Hard wearing, medium duty, easily
cleaned finishes suitable for a passenger goods
use able to accommodate rubbish bins, partitions
and Euro pallets.
Soffit rails: Stainless steel
Front wall: Stainless steel
Side walls: Stainless steel with applied panels
above and below high and low level bumper rails.
Rear wall: Stainless steel with applied panels above
and below high and low level bumper rails.
Floor: Allow for aluminium treadboard or similar.
Skirting: Stainless steel
Ceiling: White painted with twin recessed
bulkhead fluorescent fittings.
Handrails/ bumper rails: Stainless steel covered
timber cored high and low level bumper rails.
Drapes: Not required
Emergency lighting: To be provided to operate
from Nickel Cadmium batteries rechargeable –
three hour duration.
Control panel finish: Brushed satin stainless steel
to be located in the side walls 400mm from the
front wall.
Control panel features: Flush in the side wall
with tactile markings, incorporating all floor
pushes with call accepted signals door open and
close pushes, car light and service key switches,
emergency intercoms, position and overload
indicators. The floor pushes is within 900-1200mm
height. Enunciators are to be provided. Provision
is to be made for car reader security system to
restrict access.
Car position indicators: Modern digital white
LCD type.
Lighting switch: Key operated in lift cars.
Ventilation: Visible high and low level
natural ventilation with profile cut vents and
backing plates.
Fan: Not required
Overload indicator: Required
Car preference: Required
Emergency systems: Windcrest intercom, alarm
and emergency breakdown telephone system
with autodial to internal system and then external
breakdown service. Inductive loops are to be
provided for persons with impaired hearing.
Car doors: Four panel centre opening doors in
satin stainless steel.
3 3 d av ie s s t r e e t 3 8
Building Services Outline Specification
Vertical Transportation Services, cont’d
Details of Lift Car Finishes, cont’d
Weight (kg): 1000kg
Type: Heavy duty passenger/goods lift
Speed (m/s): 1.6
Capacity (persons): 26 person
Average wait time: 25 seconds Weight (kg): 2000kg
Landing Furniture
Floors served: -1, 0, 1 -5
Speed (m/s): 0.5
Position indicators: Modern digital white LCD
required all floors.
Stops and openings: 7 stops 7 openings
Floors served: -1, 0
Control system: Group control system
Stops and openings: 2 stops 2 openings
Machine room position: Machine roomless
Control system: Simplex control system
Drive system: Gearless traction variable frequency
regenerative type
Machine room position: Machine roomless
Entrance protection: Full height non contact multi
beam detectors.
Advance door opening: Not required
Pre-announcing direction indicators: Required at
all floors.
Landing stations: One riser with tactile markings
and white call accepted signals.
Landing entrances: Four panel centre opening
finished in satin stainless steel.
Fire rating: Two hours required.
Architraves: Required
Type: Small frame
Finish: Patterned stainless steel.
Sills: Heavy duty aluminium or stainless steel
suitable for pallet trucks.
Lift Details
Lift numbers: 1, 2
Type: General purpose passenger lifts
Capacity (persons): 14 person
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t Car door arrangement: Two panel centre opening
Car door dimensions: 1000mm wide by
2400mm high
Car size: 1600mm wide, 1400mm deep, 2600
internal height
Landing doors: Two panel centre opening
Landing door sizes: 1000mm wide by
2400mm high
Drive system: Gearless traction variable frequency
regenerative type
Car door arrangement: Four panel centre opening
Car door dimensions: 1500mm wide by
2100mm high
Car size: 1500mm wide, 2700mm deep, 2300mm
high, with a 700mm high top hat at the rear
Landing doors: Four panel centre opening
Shaft size: 2200mm wide by 1900mm deep
Landing door sizes: 1500mm wide by
2400mm high
Pit depth: 1500mm
Shaft size: 2500mm wide by 3100mm deep
Headroom: 4350mm
Pit depth: 1500mm
Electricity supply: 400Volt 3 phase 50 Hz 4 wire
Headroom: 4400mm
Emergency supply: DC for emergency light only
Electricity supply: 400Volt 3 phase 50Hz 4 wire
Lift numbers: 3
Emergency supply: DC for emergency light only
3 3 d av ie s s t r e e t 3 9
Professional Team
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4 0
Professional Team
Developer
Quantity Surveyors
Acoustic Consultant
Grosvenor Stow Projects 2 Ltd
Davis Langdon
Hann Tucker
70 Grosvenor Street
London W1K 3JP
MidCity Place, 71 High Holborn
London WC1V 6QS
Duke House, 1-2 Duke Street
Woking, Surrey GU21 5BA
Architects
Contractor
Party Wall Surveyor
HOK
Sir Robert McAlpine Ltd
Drivers Jonas Deloitte
Qube, 90 Whitfield Street
London W1T 4EZ
3rd Floor, 106 New Bond Street
London W1S 1SX
Athene Place, 66 Shoe Lane
London EC4A 3BQ
Structural Engineers
Planning Consultant
Occupational Audit
Ramboll UK Ltd
DP9
KKS Strategy LLP
Carlton House, Ringwood Road
Woodlands, Southampton SO40 7HT
100 Pall Mall
London SW1Y 5NQ
124 Chancery Lane
London WC2A 1PT
M,E & Sustainability Engineers
CDM Co-ordinator
MTT
Capita Symonds
9 Kingsway
London WC2B 6XF
1 Procter Street
London WC1V 6DV
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4 1
Imagery
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4 2
Grosvenor Street/
Davies Street Elevations
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4 3
Davies Street Elevation
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4 4
Reception Area
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Seating Area
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4 6
Toilets/Changing Rooms
p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4 7
Floor plate
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p r i m e m ay fa i r o f f i c e d e v e l o p m e n t 3 3 d av ie s s t r e e t 4 9
www. 3 3 daviesstreet.com
Agents
Andrew Barnes
020 7087 5769
andrew.barnes@eu.jll.com
Philip Hobley
020 7861 1192
philip.hobley@knightfrank.com
A development by
Misrepresentation Clause: Jones Lang LaSalle and Knight Frank as agents for the vendor/lessor give notice that: 1 These particulars are produced in good faith, but are a general guide only and do not
constitute any part of an offer or contract and must not be relied upon as statements or representations of fact. 2 No person in the employment of the agent(s) has any authority to make or give any
representation or warranty whatsoever in relation to this property. 3 This property is offered subject to contract. Unless otherwise stated, all rents/prices quoted are exclusive of VAT. 4 All descriptions,
dimensions, references to condition and necessary permissions for use and occupation, and other details are given in good faith and are believed to be correct, but any intending purchasers should
not rely on them as statements or representations of fact but satisfy themselves by inspection or otherwise as to the correctness of each of them. All plans are not to scale. February 2014.
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