501 Masonic Ave, San Francisco, CA 94117

The 4-unit apartment building at 501 Masonic Avenue, located in San Francisco's Lone Mountain neighborhood, is a 2-story multi-family residential structure built in 1923 and currently owned by 1099 South Van Ness LLC. The building has undergone several improvements over its lifetime, including the addition of bathrooms in two apartment units in 2018 ($15,000), electrical work for a garage door operator in 2006, window installations in 1988-1989, a reroofing project in 2000, and rear stairway repairs in 1992.

The property has experienced recurring issues with graffiti in recent years, with multiple incidents reported between June and December 2024, including an active complaint filed in January 2024 regarding graffiti on the north-facing side of the building. A significant set of housing violations was recorded in December 2004, including deficiencies related to fire safety equipment, emergency exits, and smoke detectors; however, these violations were abated by February 2005.

The building has undergone several routine safety inspections, including one by Housing Inspection Services in 2017 and an exterior-only inspection in 2001. Recent 311 calls show ongoing maintenance and safety concerns, particularly regarding graffiti removal and some infrastructure issues, though many of these cases have been resolved upon inspection by city services.