121 San Carlos St, San Francisco, CA 94110

The two-unit residential building at 121 San Carlos Street in San Francisco's Inner Mission neighborhood is a two-story flats and duplex structure built in 1906, currently owned by Stephen Patrick Butler. The building's maintenance history shows several significant improvements, including a 2005 reroofing project costing $7,000, the installation of aluminum windows in 1987, and a sidewalk permit issued in 2009.

A notable foundation work complaint was filed in August 2014 regarding cement leakage affecting sidewalks and gutters, though this issue appears to have been resolved. The property has undergone multiple fire safety inspections, with corrections made in 2022-2023 to fire extinguisher and sprinkler systems, as well as in 2014 to the alarm system, while previous hazardous materials and combustible materials complaints in 2018 were found to have no merit.

The building has experienced recurring neighborhood maintenance challenges, particularly evident in early 2025 when there were multiple reports of garbage and debris issues, including multiple instances of abandoned items such as furniture, electronics, and Christmas trees. These recent concerns, while more related to street conditions than building maintenance, suggest ongoing challenges with the property's immediate surroundings. The building's documented history shows a pattern of responsive maintenance and correction of safety concerns, with the most recent safety violations being addressed in early 2023.