575 40th Ave, San Francisco, CA 94121

The two-unit residential building at 575 40th Avenue in San Francisco's Outer Richmond district is a two-story flats and duplex structure built in 1965, currently owned by Ken Yui Wong. The property has undergone several significant modifications over time, with the most recent major change being an attempt to legalize a ground floor dwelling unit under ordinance 43-14, which was filed in December 2019.

This follows previous improvements to the ground floor including bedroom, storage room, laundry room, and bathroom additions completed in 2003, along with associated electrical work including 200-amp service installation and new lighting and receptacles in early 2004. The building's maintenance history includes two roofing projects, one completed in 2014 and an earlier one from 1995 which expired, suggesting potential concerns about the roofing system's age and maintenance. The property has experienced some infrastructure challenges, including a sewage backup incident in 2017 and a broken sewer situation in 2001 that required unpermitted plumbing work, though these issues appear to have been resolved promptly.

Recent external maintenance matters have primarily involved sidewalk issues, with multiple 311 calls in 2023 regarding sidewalk defects and curb problems, which were subsequently resolved through repairs. The area also experienced some street cleaning and parking enforcement issues between 2017-2023, including instances of sidewalk parking and general waste concerns, though these are typical urban maintenance matters rather than building-specific issues. The most recent building permit activity from 2019 suggests ongoing efforts to ensure compliance with current housing regulations.