475 21st Ave, San Francisco, CA 94121

The two-unit residential building at 475 21st Avenue, owned by Tony Chang and Wendy Tang, is a two-story flats and duplex structure built in 1916 in San Francisco's Central Richmond neighborhood. The property has undergone several significant maintenance and improvement projects over the years, with the most recent being a $10,000 reroofing project completed in 2022.

Prior to this, there were multiple window replacements in 2004, including one project completed ($4,000) and another that expired ($3,000), plus an earlier reroofing project from 1994. Historical records indicate attention to structural maintenance, with dry rot removal completed in 1986. The building has experienced minimal internal issues, with only one building code complaint noted in 2004 regarding unpermitted remodeling work, which was promptly addressed within two weeks.

More recently, there has been a recurring issue with driveway blockage, particularly during 2021-2024, with multiple parking enforcement calls, though most resulted in officers being unable to locate the offending vehicles. Other public space-related incidents include noise complaints in 2019, streetlight issues in 2017, and two reports of loose garbage on the street/sidewalk in 2013, all of which were resolved through appropriate channels. The building's permit and complaint history suggests regular maintenance and prompt response to building code issues, though the recent pattern of driveway blocking incidents may indicate ongoing challenges with parking management in the area.