42 Sumner St, San Francisco, CA 94103

The two-unit, 2-story multi-family residential building at 42 Sumner Street, owned by Wang Xiaoning & Guo Yu, was constructed in 1906 and has undergone several significant renovations and repairs over the past three decades. The most recent major improvements occurred in 2018, including the addition of a new bathroom, kitchen remodeling, and comprehensive electrical and plumbing upgrades, with a total investment of approximately $65,000. The building has a history of moisture-related issues, with notable problems documented between 2003-2005 including reports of mold and ceiling leaks, particularly affecting bathrooms and stairs.

These earlier issues prompted several completed repairs in 2005, such as stair replacements, weatherproofing work, and window repairs. The property has maintained regular maintenance standards since the mid-2000s, with no active building violations on record. Three plumbing and electrical permits from 2018 indicate substantial infrastructure upgrades, including complete rewiring of one unit and installation of modern fixtures.

Historical complaints from 2003-2004 cited various interior problems which were subsequently addressed, including damage to walls, ceilings, and tiles, though some of these issues reemerged in a 2015 complaint regarding bathroom and basement conditions. Recent 311 calls between 2023-2024 primarily relate to street-level urban management issues such as encampments and sidewalk cleaning, rather than building-specific concerns, and there have been three documented fire department responses to the building, all for non-injury-related incidents. The property's maintenance history suggests that while it experienced significant structural and maintenance challenges in the early 2000s, subsequent renovations and repairs have substantially improved the building's condition, particularly through the major upgrades completed in 2018.