673 Oak St, San Francisco, CA 94117

Located in Hayes Valley, 673 Oak Street is a three-story multi-family residential building constructed in 1909, containing 13 units and currently owned by William E. Hoskins. The building has undergone several significant renovations and improvements over the past few years, including a complete kitchen and bathroom upgrade project in 2024 (costing $316,505) affecting units 2, 4, 5, 6, 8, 9, and 10, and a reroofing project completed in late 2023 ($26,950).

A 2023 complaint about unexpected hot water issues followed the replacement of a 100-gallon water heater, while in 2024, multiple sewage back-up discharge incidents were reported from the side sewer vent. Notably, the building completed a mandatory soft-story retrofit in 2017 (cost: $223,000) under Tier 3 requirements, and there have been recurring fire safety violations between 2015-2024 related to sprinkler systems, emergency lighting, combustible materials, and hazardous materials, though most have been corrected. The building's recent history shows a pattern of maintenance and upgrade work, but also some concerning issues. In late 2024, there was a complaint about unpermitted renovation work on unit 10, following previous unpermitted renovations to multiple other units.

The property experienced significant hot water system issues in late 2023, affecting all units. Important building systems have received attention, including the installation of a new water heater in September 2023 and a complete reroofing project in 2023. Historical records show fire damage repair work was completed in 1989, and the building has maintained its 5-14 unit classification throughout its history. Regular street cleaning and sanitation issues have been addressed through 311 calls, and there have been occasional parking enforcement matters on the property.