1638-1640 Mason St, San Francisco, CA 94133

The two-story multi-family residential building at 1638-1640 Mason Street in North Beach, owned by the Dannor Lau Survivors Trust, was constructed in 1914 and contains 5 units. The property has undergone several significant safety upgrades in recent years, most notably a comprehensive fire alarm system upgrade completed in September 2023 at a cost of $28,344, which included the installation of new sounders, smokes, pull stations, and horn/strobes to comply with current fire code requirements. This was followed by a fire alarm panel modification in October 2023 to implement low frequency sounders in sleeping areas.

The most recent infrastructure work includes a sewer lateral and house trap replacement completed in September 2024. The building's history shows a pattern of attention to fire safety and building maintenance, with several routine safety inspections conducted over the years. Notable past violations from 2006-2015 included issues with smoke detectors, fire alarm system maintenance, fire extinguisher requirements, egress obstructions, combustible storage, and various other fire safety concerns, all of which were resolved by May 2015.

Prior to the recent fire system upgrades, the building underwent various improvements including reroofing (1993) and general building use confirmation (1982). While the property has experienced numerous 311 calls in recent years, these have primarily related to external issues such as scooter complaints (2023), parking enforcement matters (2019-2024), and general cleaning requests, rather than internal building concerns. The most recent significant infrastructure works, including both the fire safety upgrades and plumbing improvements, suggest that the current ownership is actively maintaining and upgrading the property to meet modern safety standards.