351-353 12th Ave, San Francisco, CA 94118

The property at 351-353 12th Avenue is a 2-unit, 2-story multi-family residential building located in San Francisco's Inner Richmond neighborhood. Built in 1913 and owned by Yan Lap Yen, this flats/duplex building has undergone significant renovations in recent years. A substantial modernization project was completed in 2016-2017, involving the construction of new spaces including three bedrooms, a home office, storage room, and two half bathrooms on the ground floor, along with upgrades to the basement including new plumbing fixtures, laundry facilities, and electrical systems.

The building's mechanical systems were also improved during this period with a furnace replacement and complete electrical upgrade including new wiring, lighting, switches, receptacles, and smoke detectors. The property has experienced some notable issues requiring attention, particularly in early 2012 when multiple violations were recorded for Unit #351, including problems with ventilation, mold/mildew, and interior paint conditions potentially presenting lead hazards. These violations were officially abated by March 2012.

More recent concerns include a 2018 complaint about construction activity occurring during early morning hours, and multiple building maintenance issues documented through 311 calls. The building's infrastructure has received regular attention, including a new bitumen roof installation in 2017 (cost: $8,000) and several plumbing and electrical upgrades. The property's rear yard/open space requirements have been maintained, and recent planning records indicate improvements including bike parking installation and an expansion at the rear of the building, while confirming that the ground floor may not be used for short-term rentals due to its configuration.