The project involved scaffolding and removal of the existing slate roofing, carpentry repairs, and installation of new slate roof system set in "J" channels, including new copper flashings.

As the structure projects nearly 300 ft. above Pennsylvania Avenue in the heart of Washington, DC, inspection and roof replacement was only facilitated by projecting 14" I-beams through the observation deck 220 ft. above the street. All scaffolding from that level and above, to the peak of the roof, was supported. It was also critical that catch platforms and netting be provided to eliminate the possibility of debris or tools exiting the roof level. As the Old Post Office Tower building has both retail and offices, crowd control and pedestrian protection was provided through the use of platforms and strategically placed signage.