10 Sumner St, San Francisco, CA 94103

The property at 10 Sumner St is a 2-story, 4-unit multi-family residential building constructed in 1908, located in the South of Market neighborhood and currently owned by Mak Jesamine W. The building has a complex history of unauthorized unit conversions and subsequent legalization efforts. Most recently, in 2022, a permit was issued to legally establish a dwelling unit (Apt #E) containing a bedroom, living room, bathroom, and kitchen, for which the owner invested $139,800. This followed earlier attempts to document the unit's existence, particularly a 2007 permit application to document residential units and install new water heaters, along with commercial space modifications.

The building has experienced recurring maintenance and safety issues over the years, with multiple tenant complaints and violations recorded between 2001 and 2015, including concerns about window bars, water leaks, electrical issues, mold, and unauthorized unit conversions. Significant building violations in 2003 included problems with fire escape obstruction, emergency egress, damaged walls, and roof water seepage, most of which were abated by July 2003. The property has also undergone various repair and compliance work, including electrical system upgrades in 2008 and plumbing modifications. More recent issues have primarily involved infrastructure, with multiple 311 calls in 2024-2025 reporting sidewalk defects and debris concerns in the surrounding area, though these are external to the building itself. Two fire-related complaints from 2009 were promptly resolved with conditions corrected.

The building's history suggests ongoing efforts to address and legalize previously unauthorized modifications, with varying degrees of success, while maintaining compliance with safety and habitability standards. The most current internal complaint from January 2015 regarding bedroom window configuration and electrical wiring remains listed as active, though it has not been formally resolved in the available records. The property's documented history shows a pattern of unauthorized unit conversions and subsequent attempts at legalization, with notable periods of maintenance and safety concerns particularly between 2001-2003 and 2005-2008. Building improvements have generally focused on compliance with housing codes and safety requirements, though some historical violations suggest periodic lapses in maintenance and safety standards. The property has benefitted from recent legalization efforts and infrastructure improvements, though external environmental factors such as sidewalk conditions and adjacent street maintenance continue to be monitored through 311 calls.