1521-1523 Lake St, San Francisco, CA 94118

The property at 1521-1523 Lake Street is a two-unit, two-story multi-family residential building constructed in 1914, currently owned by Frank L. Kong. The building's maintenance and upgrade history includes several completed permits between 1985 and 2003, such as a non-seismic upgrade, plaster wall repairs, kitchen modifications, and an underground electrical service conversion to 200A with two meters.

However, recent concerns have emerged regarding potential unauthorized modifications, with two complaints filed in March 2023 alleging the presence of an unauthorized ground floor unit (1521A) and unauthorized construction work in the basement, with supporting video evidence of three advertised units. These complaints are of particular significance given their recent nature and implications for building code compliance. The property's maintenance record shows various infrastructure issues over the years, including flooding problems in 2017, sidewalk defects in 2022, and two instances of driveway blocking by vehicles in 2018.

A tree maintenance matter was documented and referenced the city's StreetTreeSF program in 2019. There was also an unauthorized construction complaint in 2004 regarding basement work, though this was eventually closed. The building has undergone several legitimate improvements over the decades, including basement alterations and bathroom modifications, and appears to have received proper electrical system upgrades with the 2003 conversion. The most pressing concerns currently revolve around the potential existence of unauthorized units and recent construction work, which have generated the latest complaints to Housing Inspection Services.