166 20th Ave, San Francisco, CA 94121

The three-story, two-unit multi-family residential building at 166 20th Avenue, constructed in 1906 and currently owned by the Charles P Huff Trust, has a concerning history of safety violations and maintenance issues that warrant attention. The most significant active violations, dating back to February 2004, involve serious life safety concerns including a hazardous water heater installation with combustion byproducts leaking into the kitchen, improper flue ventilation, and additional violations related to wall heaters, laundry facilities, and bathrooms.

These violations were formally documented in March 2004, with the matter being referred to the Department of Building Inspection and Code Enforcement Division. A prior safety concern was documented in August 2002 when a complaint was filed regarding the blocking of a fire exit door and inoperable windows in the lower unit. The building has undergone some maintenance work, including a $5,000 repair of dry rot and back stairs in 2001, though these repairs were not visible from the street.

A reroofing project initiated in 1996 was permitted but eventually expired without record of completion. While there have been several 311 calls to the area between 2008 and 2020, these primarily concerned abandoned vehicles near the property rather than building-specific issues, and all were resolved by the Department of Transportation's Abandoned Vehicles Work Queue. The building's documented history suggests persistent safety and maintenance challenges that have remained unresolved for extended periods, particularly the active code violations from 2004.