275-277 23rd Ave, San Francisco, CA 94121

The two-unit multi-family residential building at 275-277 23rd Avenue in the Central Richmond neighborhood, owned by Trinh Wellington, is a two-story flats and duplex structure built in 1917. The property has a notable history of sewer-related issues, particularly in 2022, with three documented sewage backup incidents in June and August involving a 4-inch sewer vent, and multiple reports of human or animal waste on the property or nearby public areas between March and August 2022.

These sanitation challenges appeared to decrease in frequency following 2022, with only one related incident recorded in 2021 before that period, and no further similar complaints in recent years. The building's permit history shows a cancelled attempt at a horizontal addition in October 2001, though it remains unclear whether this work was ever attempted through other permits.

More recently, there was one parking-related complaint in June 2023 regarding a vehicle blocking a driveway, though responding officers were unable to validate the reported issue. The concentration of sewer and sanitation-related incidents in 2022 suggests this was a significant period of infrastructure or maintenance challenges for the property, though subsequent years have shown improved conditions in this regard.