Built in 1942, Potowmack Crossing Condominium is a 242-unit garden-style community located in the Old and Historic District of Alexandria. The aluminum single-hung windows installed in the mid-1980s were in poor condition, and TDL was chosen to assist with a community-wide window replacement project. Due to the property’s location, projects altering the exterior appearance of the property are subject to design guidelines and review from both the Old and Historic District, as well as the National Park Service. We evaluated various window options, consulted with the City’s historic staff, and installed several mockups before arriving at a final selection. We prepared specifications to replace nearly 1,400 windows with fiberglass double-hung windows, assisted in obtaining City approval, competitively bid on the project, and provided construction administration services while the windows were being replaced.