The Main Street Post Office was designed by architect Louis A. Simon, who used a similar architectural plan for post offices across the country. The
building's architecture is considered a restrained style, with the
minimal ornamentation preferred by the U.S. Treasury Department which funded the project. Simon also designed the Internal Revenue Service building in
The grand opening of the Main Street Post Office
was greeted with banners, speeches by local officials, and live music. A
photograph of the Post Office's dedication in December 1935 is still
featured in the lobby, in an original glass-fronted case.
The California Preservation Foundation reports the Main Street Post Office retains all its architectural integrity and is one of the last historic structures left on Main Street and is a local landmark. In 2009, the U.S. Postal Service listed the Main Street Post Office on a list for potential closures as a non essential facility.
Now over eight decades old, the Main Street Post Office is considered eligible for listing on the National Register of Historic Places.