3674 16th St, San Francisco, CA 94114

Located in the Duboce Triangle neighborhood, 3674 16th Street is a three-story, 5-unit multi-family residential building constructed in 1890 and currently owned by Zhang Tong Tong. The property has undergone several significant improvements over the past decade, including completed soft-story seismic retrofitting in 2017 (tier 3), comprehensive unit renovations in 2017 (including Unit #1 and Unit #4), and roofing work in 2018 costing $9,500. Major infrastructure updates include a plumbing system upgrade with sewer line replacement in 2017, electrical system improvements, and multiple kitchen and bathroom remodels.

However, recent concerns have emerged regarding unpermitted work at the property, particularly a potentially unauthorized bathroom addition (reported August 2022) and sewer lateral replacement work (September 2023) that reportedly obstructed public access and violated ADA requirements. The building has a history of compliance issues dating back to 2001, when multiple violations were recorded related to stairs, smoke detectors, and combustible storage, though these were all abated by 2003. There were also significant concerns in 2018 regarding lead paint removal practices, and complaints about possible unpermitted dwelling unit conversions and short-term rental activity were filed in 2018.

The property has experienced some maintenance challenges as evidenced by multiple 311 calls, particularly relating to sewer issues in 2021 and exterior maintenance concerns. While most recent building work has been permitted and completed, the pattern of recent complaints suggests ongoing concerns about compliance with building codes and regulations. The building's historical records show a pattern of permits for various improvements and repairs, indicating regular maintenance and upgrading of the property over time.