641-643 Lisbon St, San Francisco, CA 94112

The three-story multi-family residential building at 641-643 Lisbon Street, located in the Excelsior neighborhood, was constructed in 2010 by owners Deng Kent and Ouyang Hai Ying. The property underwent significant modifications between 2007 and 2018, most notably the legalization of a ground floor dwelling unit in 2017-2018 following a housing code violation notice that cited unauthorized kitchen conversion, lack of proper heat source, unapproved wiring and plumbing, and mold issues.

This unit legalization project, completed at a cost of $105,000, included electrical work for new lights, plugs, and switches, along with the relocation of mechanical systems like the water heater and furnace. Prior to the unit legalization, the building had undergone various improvements including the installation of comprehensive plumbing and electrical systems with multiple bathrooms, kitchen facilities, and laundry infrastructure in 2009, as well as structural modifications including retaining wall improvements, window revisions, deck addition, and stairs relocation.

More recently, in 2021, the building received renewal permits for plumbing and electrical work, suggesting continued maintenance and compliance efforts by the owners. The property has experienced recurring issues with parking enforcement, as evidenced by multiple citations in late 2024, though these are external to the building's condition or systems.