In 1978 AIA Philadelphia organized an unjudged sketch problem to solicit ideas for a large block made vacant by the demolition of the Gimbels department store. Claflen Associates took the opportunity to explore high density mixed use in a mid-rise setting.

The project proposal intensifies the link between Market and Chestnut Streets through the renovation of the block- long post office that already exists to the west of the Gimbels block. On the block itself a multi-level retail base linked the subway, entertainment, and parking. This base provided access to the regular office space above. The scheme's goal of organizing contemporary functions in a manner supportive of the existing urban fabric of the city was clearly understood and supported by the reviewer from the Philadelphia Inquirer.