3971 Mission St, San Francisco, CA 94112

3971 Mission Street is a two-story, four-unit multi-family residential building located in San Francisco's Bernal Heights neighborhood, constructed in 1953 and currently owned by Salvatore J. and Linda Rizzo. The building has undergone significant repairs and improvements in recent years, most notably following a serious gas explosion in November 2017 that caused substantial damage to windows on all floors and structural components.

The post-explosion rehabilitation work, completed between 2018 and 2019, included the replacement of aluminum windows, comprehensive electrical rewiring, plumbing improvements (including new fixtures and a shower pan), and interior repairs in Unit 1, with costs totaling over $190,000. The building's systems have seen considerable upgrades, including electrical panel improvements in 2003, with all recent permits marked as complete. The property has a historical record of compliance issues, particularly in 2001 when multiple fire safety violations were documented, including problems with smoke detectors, fire extinguishers, and smoke enclosure doors, all of which were resolved by September 2001. A 2015 routine inspection revealed concerns about lead paint and egress obstruction, which were addressed.

More recent inspections have not revealed any active violations. The building's maintenance history shows regular upkeep, including sidewalk repair in 2003 and various window installations in the 1990s. While there have been concerns about garbage management and exterior maintenance, as evidenced by multiple 311 calls regarding cleaning issues, these appear to be routine urban maintenance matters rather than building-specific problems. The most recent inspection history has been relatively clear of major issues, suggesting improved maintenance practices in recent years.