4421-4423 Mission St, San Francisco, CA 94112

The two-unit, two-story mixed-use building at 4421-4423 Mission Street, constructed in 1947, has undergone several significant changes and faced multiple safety concerns over the years. Most recently, in October 2024, the building underwent re-roofing work costing $16,750. However, there are ongoing safety concerns, particularly about unpermitted structures; an active violation from 2016 cites multiple unauthorized structures in the rear yard creating a "heavy fire load." The building has a documented history of fire safety issues, with eight fire complaints between 2006 and 2016, mostly related to combustible materials and weeds, though most were promptly corrected.

A recent tenant complaint from November 2024 reported issues with restaurant exhaust systems causing noise and carbon dioxide concerns. The property has seen various improvements and modifications, including a 2011 installation of an automatic fire suppression system, a 2010 restaurant remodel with kitchen hood installation, and several plumbing and electrical upgrades between 2008-2010. Historical complaints indicate past safety concerns, including three separate gas leak incidents in 1995, though these were promptly resolved. The building has undergone some structural changes, including the demolition of a 1-story storage unit in 2018, and there were earlier complaints about water heater installations and drainage issues that were resolved in 2009.

Recent maintenance activities include a sewage backup response in October 2024 and multiple reports of garbage and debris, though these environmental issues are mostly administrative rather than structural or safety concerns. The property’s history includes both building and fire safety violations, with the most pressing current issue being the unpermitted structures in the rear yard. While many past violations have been resolved, the building has a pattern of requiring ongoing maintenance and compliance updates, particularly regarding fire safety and unauthorized modifications. Recent permits and complaints indicate continued active use as a restaurant, with periodic issues requiring attention from various city departments.