Ellenzweig Associates designed the ramps, stairs and ventilation shafts to have minimal impact on the park. The solution was to isolate the air intakes in a corner of the park and to incorporate exhaust vents into the automobile ramps, which are screened from pedestrians. Ticketing and cashiers are also located on the lobby level to avoid disturbing the park. A major goal of this project was to extend the grace and elegance of the park into the garage, while providing easy access, clear orientation and a sense of security. All circulation revolves around a single elevator core, identified by a decorative neon light that is visible from anywhere in the garage.
Lobbies have elegant terrazzo flooring and granite walls in subtle colors.
The walls, ceilings and columns of the garage are painted white, with perimeter walls carefully lit to create a bright, appealing environment. Post Office Square is a widely praised boon to downtown Boston. Designed as a non-profit, privately financed facility for public use, Post Office Square will revert to city ownership once construction costs are repaid. Garage profits will be distributed to the City of Boston and its Park Trust Fund for the maintenance of neighborhood parks. .