1142-1152 Mason St, San Francisco, CA 94108

The three-story, six-unit multi-family residential building at 1142-1152 Mason Street in Nob Hill, owned by the Woo Hing Revocable Trust, has undergone significant safety upgrades and improvements since its construction in 1907. Most notably, the building completed its mandatory soft-story retrofit program requirements (Tier 3) and received its Certificate of Final Completion (CFC) status, demonstrating compliance with earthquake safety regulations. In recent years, the building has prioritized fire safety, with a comprehensive $24,000 fire alarm system upgrade completed in 2023, including installation of low-frequency sounders in sleeping areas, sprinkler monitoring modules, and device compatibility updates.

The property also underwent substantial improvements in 2019, including the conversion of basement storage space to an ADU (Accessory Dwelling Unit) and a kitchen remodel on the second floor, significantly modernizing the building's amenities. The building has faced several maintenance and safety challenges over its history, though most have been addressed promptly. A notable incident occurred in September 2021 when there were heat-related complaints filed by residents, though these were resolved quickly within 10 days.

Other historical violations included issues with stair repairs, fire extinguisher maintenance, and unauthorized construction, all of which were addressed through proper channels. The building's plumbing and electrical systems have received significant attention, with multiple permits indicating systematic upgrades to meet current codes, particularly focusing on fire safety and modernization of electrical infrastructure. Recent 311 calls have primarily concerned street-related issues rather than building-specific problems, indicating improved property management and maintenance in recent years.