Completed in 1930, Tilden Gardens Cooperative is a 7-building, 170-unit community located in the Cleveland Park Neighborhood of Washington, DC. The original 1,400+ building windows were wood and varied widely in condition. TDL was selected to guide the cooperative in addressing this situation such that all windows would be operable and in similar condition. Due to the property’s location, projects altering the exterior appearance of the property are subject to review by DC’s Historic Preservation Office and Historic Preservation Review Board. 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, bid, and oversaw construction services for the installation of aluminum-clad replacement windows and restoration of original windows.