Rincon Center, Art Deco building complex in South of Market, San Francisco, United States.

Rincon Center is a Streamline Moderne building complex occupying an entire city block near the Embarcadero and featuring a five-story interior atrium with a skylight. Stone relief friezes depicting dolphins adorn the exterior facade.

The building opened in 1940 as the Rincon Annex post office and served as a major postal processing center with around 1,500 workers. Operations shifted to another location in 1979, ending its role as an active postal facility.

The lobby holds Anton Refregier's 27 tempera-on-gesso murals, painted 1941–1948 under the Treasury's Section of Painting and Sculpture. They depict California history and San Francisco's role in it; critics in Congress called for their destruction after World War II. The murals are why the post office lobby was kept in the 1980s development.

The complex sits at the intersection of Mission and Spear Streets in downtown San Francisco, making it easy to locate. Today you can enter the building to explore the interior atrium and browse shops, restaurants, and offices.

The 1988 renovation was an ambitious project that added two stories to the complex while respecting Gilbert Stanley Underwood's original design. This expansion allowed the building to house modern apartments, shops, and offices while preserving its historic character.