470 20th Ave, San Francisco, CA 94121

The two-story, four-unit apartment building at 470 20th Avenue in the Central Richmond neighborhood was constructed in 1971 and is currently owned by Ke Li Tuan Tr. The property has undergone several significant improvements over the years, including a comprehensive window replacement project in 2005 costing $11,500 that updated all units and skylights, and a patio door and window modification in September 2005.

An important maintenance work was performed in 1998 when the building underwent reroofing. The building's most serious issues were identified during a routine housing inspection in August 2003, which revealed multiple fire safety concerns that required attention. These included the need for smoke detectors in the lobby, maintenance of smoke enclosure doors, and concerns about combustible storage that required either removal or the installation of automatic fire sprinklers.

All these violations were officially abated by October 3, 2003, indicating that the building met safety requirements following this remediation work. A prior routine inspection was conducted in August 1998, which was also resolved by October 19 of the same year. Since the 2003 violations were resolved, there have been no additional building complaints or violations reported, and the property has maintained an active status without any recent safety or maintenance concerns being documented.