1355 Mason St, San Francisco, CA 94133

The three-story, 16-unit multi-family residential building at 1355 Mason Street in Nob Hill, owned by Mac Family Trust, has a complex history marked by multiple safety concerns and recent compliance efforts. Built in 1911, this apartment building completed its mandatory soft-story retrofit in 2017 at a cost of $100,000, demonstrating compliance with seismic safety requirements. The property underwent significant scrutiny in 2017 when a major violation was documented regarding unauthorized dwelling units and numerous life safety hazards, including unapproved electrical and plumbing work, lack of smoke and carbon monoxide alarms, rodent infestation, and inadequate egress.

This violation was eventually abated in April 2023, though a new sleeping area requirement violation was issued in December 2023 that remains open as of now. The building's maintenance and safety record includes several important interventions over the years, such as the removal of an unpermitted balcony deck in 2003, repairs to address dry rot in 2000, and various routine safety inspections. More recent history shows fire safety concerns being addressed, with corrections made to sprinkler systems in 2024 and fire extinguisher issues resolved in 2022.

The property also experienced plumbing issues with documented sewage backups in 2020, and it has undergone recent inspections and correction orders related to the condition of common areas. Historical complaints from 2000-2001 noted problems with interior surfaces, weatherproofing, electrical systems, and windows, though these were abated. While the building has shown progress in addressing many violations and completing required work, the outstanding sleeping area violation and the building's complex regulatory history warrant continued attention to ensure ongoing compliance with safety requirements.