Directions to University of Colorado Hospital Laboratory @ The Leprino Office Building (LOB) 12401 E. 17th Ave, Aurora Co. From I-70: Go South on Peoria Street to 17th Ave. Turn left onto 17th Ave and cross Quentin St. at the stop sign. From Downtown Denver: Go East on Colfax Ave to Quentin Street. Turn left at Quentin St. and go north to 17th Ave. Turn right at 17th Ave. From I-225: Go West on Colfax Ave to Quentin St. Turn right at Quentin St. and go north to 17th Ave. Turn right at 17th Ave. The Leprino Office Building (LOB) is a ten story office building on the left hand side of 17th Ave. The address is 12401 E. 17th Ave. There is a pay parking structure right next to the LOB, just follow the signs for visitor parking. Parking is $5.00 when exiting the structure, but the lab will provide a parking voucher for free parking. After parking enter the LOB through the front doors and take the elevators to the 2nd floor. The laboratory check-in window is just inside the double doors as you get off the elevator. The room number is 253.