631-633 Frederick St, San Francisco, CA 94117

The two-story multi-family residential building at 631-633 Frederick St, owned by Ronald & Jeannie Ma Yee Fml, was constructed in 1909 and contains 5 units. The property underwent a mandatory seismic retrofit in 2014 as part of its Tier 3 Soft Story program, with comprehensive improvements including foundation bolting, wall reinforcement, and installation of plywood sheathing, completed at a cost of $30,000.

The building has a history of maintenance issues, with multiple roof replacements documented between 2000-2005, and some concerning recent complaints; most notably an active 2022 complaint regarding original windows, sealing issues, and mold problems. The building experienced several violations in 2003 that were subsequently addressed, including fire proofing repairs, stair repairs, and installation of self-closing devices on exterior doors. Recent maintenance records show ongoing care for the property, including tree maintenance issues in 2024 and various street cleaning matters through 2025.

The building has had two fire-related service calls in recent years, though neither resulted in civilian injuries or significant incidents. Historical renovation work includes interior updates from the 1990s, such as kitchen cabinet replacements and bathroom renovations. The property's most pressing current issue appears to be the active 2022 complaint regarding windows and mold, while historical records show periodic maintenance issues typical for a building of its age and type.