647 33rd Ave, San Francisco, CA 94121

The two-unit residential building at 647 33rd Avenue in San Francisco's Outer Richmond district, owned by Walter and Monica Kwok, has been standing since 1925 as a two-story flats and duplex structure. The property has undergone several significant maintenance works over the years, with the most recent major repair occurring in October 2021, involving work on the backyard stairs, rear siding, and roofing with a cost of $80,000.

Historical records show earlier roofing work completed in 1992, and a final inspection permit from 1976. The building experienced a notable series of sewer-related issues between 2018 and 2020, with eight documented sewage backup incidents primarily involving 4-inch sewer vents. These problems seemed to be recurring, with multiple incidents recorded between January 2019 and January 2020, though all were ultimately resolved through various maintenance actions including flushing and trap relief.

The most recent incidents outside the sewer domain include two parking-related complaints in 2023 and 2020, both of which were promptly addressed by parking enforcement. A 2018 report of an abandoned vehicle was resolved when the vehicle was no longer present upon inspection. Despite the historical sewer issues, all documented cases were addressed and resolved through appropriate municipal and private interventions.