509-511 18th Ave, San Francisco, CA 94121

The two-unit residential building at 509-511 18th Avenue in San Francisco's Central Richmond neighborhood is a two-story flats and duplex structure built in 1917, currently owned by Xu Donghua and Qin Caihua. The property has undergone several significant maintenance and improvement projects over the past three decades, including a comprehensive kitchen renovation in 1999 that involved new cabinets, sink, stove, electrical work, and countertop installation. More critically, in 1990, the building underwent important structural work that included bolting the mudsill to the foundation and repairing stairs and landing areas affected by dry rot.

An attempt to secure the roof was documented in 1994 through a permitted reroofing project, though this permit ultimately expired. In recent months (April to May 2024), the property has experienced multiple maintenance and parking-related issues. Notably, there was a sewage backup incident reported in late May 2024, which was subsequently resolved by PUC Sewer Operations.

The property is also currently experiencing an unresolved issue with tree roots lifting the sidewalk, which was reported in May 2024. There has been a notable pattern of parking enforcement calls, with multiple reports of vehicles blocking driveways between April and May 2024, though most of these cases were either resolved with citations or officers being unable to locate the offending vehicles. Other municipal service calls during this period included reports of street defects and one case of an abandoned vehicle, which was towed on May 1, 2024. While these recent issues primarily relate to parking concerns and routine municipal services, the building's historical permits indicate previous attention to both cosmetic improvements and structural integrity maintenance.