An avenue is traditionally a straight road with a line of trees or shrubs running along each side, which emphasize arrival at a landscape or architectural feature. * A boulevard is usually a widened, multi-lane arterial street with a median and landscaping between the curbs and sidewalks on either side The building envelope remains one of the most important exterior elements for building functionality. While the façade is an elegant component that helps to define the unique architectural aesthetics of the building, it also has the critical role related to energy performance and interior function of a building Urban structure is the arrangement of land use in urban areas, in other words, how the land use of a city is set out. The built environment encompasses places and spaces created or modified by people to serve their needs of accommodation, organization and representation. defined as the distinct, recognizable and consistent pattern of elements in an area. these patterns that give each locality its 'sense of place', Ekistics concerns the science of human settlements, including regional, city, community planning and dwelling design Suburbanization is a population shift from central urban areas into suburbs , resulting in the formation of (sub)urban sprawl. Gentrification is a highly contested issue, in part because of its stark visibility. Gentrification has the power to displace low-income families or, more often, prevent low-income families from moving into previously affordable neighborhoods. The term ‘urban fabric’ describes the physical characteristics of urban areas, that is, cities, and towns. This includes the streetscapes, buildings, soft and hard landscaping, signage, ligh ting, roads and other infrastructure. Urban fabric can be thought of as the physical texture of an urban area. The green belt is a specially designated area of countryside protected from most forms of development. It is protected to help stop urban sprawl, preserve the character of existing settlements and encourage development within existing built-up areas.