644-648 Natoma St, San Francisco, CA 94103

The 9-unit, 3-story multi-family residential building at 644-648 Natoma Street, built in 1907, has undergone significant improvements and faced various challenges over the years. Most notably, a comprehensive upgrade between 2017-2018 included the installation of a 400-amp service, wiring for three new ADUs, and the implementation of a ground floor fire sprinkler system with 46 sprinklers at a cost of $15,000. Additional improvements included new plumbing fixtures in three kitchens and bathrooms, installation of waterproof shower pans, and the addition of a backflow preventer in 2020.

The property has experienced several maintenance and safety concerns over its history. In 2011, multiple violations were recorded regarding lead paint hazards, structural issues (including stairs and siding repairs), and fire safety concerns, though these were all abated by August 23, 2011. More recent issues include sidewalk defects noted in multiple 311 calls between 2023-2024, and a complaint about trip hazards from video cables in November 2024. The building was also classified as a Tier 4 soft-story structure, with required seismic work completed and a Certificate of Final Completion (CFC) issued.

While there were some historical fire safety concerns in 2006-2009, all were either found to have no merit or were corrected promptly. Recent maintenance records from 2023-2024 show ongoing challenges with garbage and debris management in the vicinity of the building, with multiple reports of waste requiring cleaning. The most recent permitted work has generally focused on infrastructure improvements and safety upgrades. The building's ownership has taken significant steps to modernize and improve safety systems, including fire prevention and electrical systems, while addressing most historical violations and complaints.