459-461 Potrero Ave, San Francisco, CA 94110

The two-unit residential building at 459-461 Potrero Ave, located in San Francisco's Potrero Hill neighborhood, is a two-story flats and duplex structure built in 1906, currently owned by Sue Jin Hwang. The property has undergone several significant maintenance and improvement projects over the past two decades, with the most recent being a voluntary seismic retrofit in 2022 costing $18,480 focused on sill plate anchorage. The building has experienced recurring sewer system issues, with the most recent sewage backup incidents reported through 311 calls in 2024 and 2022, and a sewer drain house trap replacement completed in 2009.

The property underwent substantial interior work in 2005-2006, including kitchen and bathroom renovations, pantry remodeling, deck repairs, and reroofing, though these improvements were preceded by building complaints regarding unpermitted work that were ultimately resolved. Structural maintenance has included the replacement of the rear retaining wall in 2006 and electrical system upgrades such as conduit and wire replacement for the 200-amp service in 2015. The building's recent history has been marked by periodic maintenance and repair work, with several 311 calls in 2022-2024 primarily related to graffiti and sewer issues, as well as sidewalk cleaning.

The property has been responsive to enforcement actions, with building violations from 2005 regarding unauthorized remodeling being promptly addressed. Historical issues include a 1999 plumbing complaint regarding a leaking waste pipe that was resolved, and multiple instances of graffiti in recent years. While the building has required various repairs and improvements over the years, particularly regarding its infrastructure systems, the most significant recent work has been focused on seismic safety improvements and routine maintenance.