131 20th Ave, San Francisco, CA 94121

The 7-unit, 2-story multi-family residential building at 131 20th Avenue, owned by the Mark J Murdoch Trust, was constructed in 1951 in the Lake-Presidio neighborhood. The building's maintenance record shows several significant infrastructure updates, including a main sewer replacement with house trap in 2018, water line replacement in 2012, reroofing in 1996, and aluminum window installations in 1984.

A noteworthy incident occurred in March 2002 when the building was issued multiple housing code violations related to fire safety and security, including issues with the fire escape drop ladder, central alarm system, combustible storage, smoke enclosure door closer, and required deadlatch locks at exit doors; however, all these violations were promptly abated by April 12, 2002. Recent activity at the property has primarily involved parking-related issues, with multiple reports of driveway blocking between June and October 2024, resulting in several citations being issued.

There were also two reports of garbage and debris issues on September 4, 2024. A routine housing inspection in July 2008 appears to have returned no significant findings, and there was one recorded fire incident, though it was classified as a false alarm with no civilian injuries reported. The building's permit and violation history suggests attention to core infrastructure maintenance, though some age-related systems require ongoing monitoring.