650 20th Ave, San Francisco, CA 94121

The two-unit multi-family residential building at 650 20th Ave in the Central Richmond district, owned by Raymond R. Lui and Amy M. Leung, has undergone numerous significant modifications since its construction in 1925.

The property has a complex history of unit conversions and code compliance issues, most notably in 2004-2005 when violations were filed regarding an unauthorized extra dwelling unit on the second floor, illegal plumbing work, and improper kitchen installations. These violations were eventually abated by May 2005, along with electrical safety concerns related to light fixtures and wiring. The building experienced multiple renovations between 2004-2006, including attempts to convert between one and two units on the second floor, major electrical upgrades, and bathroom remodels, with some work completed under proper permits and other work generating complaints. In recent years, the property has faced recurring sewer issues, with three documented sewage backup incidents between 2022 and 2024, suggesting ongoing infrastructure challenges.

The building's maintenance history includes various improvements such as kitchen remodels, bathroom renovations, and electrical upgrades to 200-amp service with three meters. While most historical violations have been resolved, two plumbing complaints from 1998 and 1999 remain active in the system. The property has required multiple municipal interventions for various issues, including construction noise complaints, parking violations, and sidewalk maintenance concerns, though most recent service requests have been promptly resolved. The most significant recent issues appear to be concentrated around sewer system problems, with multiple service calls in the past two years reporting 4-inch sewer vent issues.