644-678 Lyon St, San Francisco, CA 94117

The 18-unit, three-story apartment building at 644-678 Lyon Street, owned by Raul & Denise Arriaza, has undergone several significant safety and maintenance improvements since its construction in 1902. Most notably, the building completed a mandatory soft-story retrofit in 2016 (Tier 2) to improve seismic safety, followed by additional foundation work in 2018. Recent safety enhancements include a comprehensive fire alarm system upgrade in 2023 to comply with San Francisco Fire Code requirements, which was completed at a cost of $65,988.

This upgrade included the installation of new smoke detectors, manual pull stations, and a wireless alarm communicator. The building has experienced recurring pest issues, with the most recent complaint in August 2024 reporting an ongoing rodent problem in unit 672. Historical maintenance records show various apartment improvements in the late 2000s, including bathroom and kitchen renovations in units 670 and 648, respectively.

The building's safety systems have required regular attention, with multiple fire safety complaints recorded between 2017 and 2024, though most were resolved promptly with no merit or with conditions corrected. Historical building issues documented in the late 1990s included concerns about foundation movement, door operation, and plumbing problems, though these appear to have been addressed. The property has also maintained its street-facing infrastructure, with sidewalk repairs completed in 2012. Recent 311 calls primarily relate to parking enforcement, graffiti removal, and street cleaning matters, which are typical for urban properties.