In this snapshot from November 1937, we see the GREENBELT CENTER Co-op Service Station, which was still under construction. 
Photo from Library of Congress / John Vachon


A second view, from September 1938, shows the finished Service Station. 
Photo from Library of Congress / Marion Post Wolcott


Prices at the community-owned "Town Pump" Service Station, circa-1938.


The original Post Office in GREENBELT CENTER was a "fourth class" operation, which did not deliver mail to individual residences. 
Photo from Library of Congress / Arthur Rothstein