- Opened: 1884, as part of Civil War Reconstruction
- Original Function: U.S. Custom House, U.S. District Court, and Post Office
- Architect: Alfred B. Mullett, who also designed the Executive Office Building in Washington, D.C.
- Architectural Style: Second Empire
- Innovations: elevators; central heat; fireproof cast iron used throughout; a private railroad tunnel for mail
- Preservation: The city post office closed in 1970 and the building fell into disrepair. Through a series of partnerships, developers preserved the building for adaptive reuse between 1998 and 2006.
Source: St. Louis' U.S. Custom House & Post Office Building Associates, L.P. [accessed June 30, 2012]