1143-1145 Mariposa St, San Francisco, CA 94107

The property at 1143-1145 Mariposa Street in Potrero Hill is a 3-unit, 2-story multi-family residential building constructed in 1900, currently owned by Richard J. and Dina A. Dwyer.

The building has a notable history of permit compliance issues, particularly concerning exterior work. Most recently, in October 2021, a violation was filed for unauthorized exterior siding replacement and flashing work, which was subsequently addressed through a permit (202111011519) completed in December 2021 at a cost of $5,000. In 2008-2009, the property underwent kitchen remodeling work in the lower level unit that resulted in multiple code enforcement actions due to work being performed without proper permits, including electrical and plumbing modifications. These violations were ultimately resolved through the appropriate permits and inspections.

The building's maintenance history includes a successful roofing project completed in 1990, and the installation of a Valor gas fireplace in 2009. A significant historical context is provided by a property records entry showing a lot split involving 211 Texas Street, 1143/1145 Mariposa Street, and 215 Texas Street, along with a proposed roofdeck greenhouse/sunroom project that was reviewed but appears to have required additional considerations. More recently, there have been multiple parking-related complaints in the vicinity of the building between late 2024 and early 2025, though these are external to the building's operations. A fire alarm system inspection in 2019 found no merit to any concerns.