509-511 7th Ave, San Francisco, CA 94118

The two-unit residential building at 509-511 7th Avenue in San Francisco's Inner Richmond district is a two-story flats and duplex structure built in 1912, currently owned by Nancy S L Wong and Norma S.

This multi-family residence has undergone several significant maintenance updates over the years, with the most substantial being a $9,800 reroofing project completed in 2019, demonstrating attention to structural maintenance. Earlier building improvements include the installation of aluminum windows in 1983, and a minor street space permit was issued in 2016 for $1.

While the building's maintenance record shows attention to basic upkeep, there have been two notable infrastructure issues reported through the city's 311 system: a sidewalk defect in 2013 that was investigated but found to be non-existent at the reported location, and a sewage backup incident in 2009 involving a 4-inch vent issue that required intervention from PUC Sewer Operations. It's worth noting that the building's documented history shows no recent recurring issues or ongoing safety concerns, with the most recent significant infrastructure maintenance being handled appropriately through proper permitting channels.