507 Holloway Ave, San Francisco, CA 94112

The two-unit residential building at 507 Holloway Ave in the Ingleside neighborhood, owned by the Tam/Fung Family Trust, has a history dating back to its 1925 construction as a flats and duplex structure. The property underwent significant modifications in the early 1990s, including a 1993 completed permit for a 1-story vertical addition and rear yard sunroom valued at $123,500, followed by minor framing changes in 1994.

However, there remains an active building complaint from October 1994 regarding unauthorized modifications to the backyard area, with concerns about deviations from original plans and permits. More recent history reveals recurring sewer issues, with multiple sewage backup incidents reported between 2021 and 2024, including three separate incidents in January 2024 alone. These sewer problems have generated several 311 calls, and while each incident was marked as resolved, the frequency suggests an ongoing infrastructure challenge.

Additional incidents in 2023-2024 involved minor neighborhood issues such as parking violations and abandoned vehicles, though these are unrelated to building condition concerns. A fire complaint regarding combustible materials was filed in 2005 but was determined to have no merit, and there was one documented water or steam leak incident with no civilian injuries, though the exact date is not specified. The building's documented history combines both significant structural modifications from the 1990s and persistent maintenance challenges in recent years.