1635 20th Ave, San Francisco, CA 94122

The property at 1635 20th Avenue in the Central Sunset neighborhood is a three-story, two-unit multi-family residential building constructed in 1925 and currently owned by the Loncar Family Trust. The building has undergone several significant modifications and faced various compliance issues, particularly in 2012. Most notably, there were violations related to unpermitted electrical wiring in the bedroom, bathroom, and kitchen areas of the existing garage, which were documented in complaints filed in April 2012.

These electrical violations led to associated electrical permits and penalties. In the same timeframe, building modifications included the removal of a closet in the garage and bathroom work to address code compliance issues, along with the capping of plumbing fixtures previously used for shower facilities. These changes were completed by late 2012, when the building violations were officially abated.

The building's history includes earlier modifications such as a proposed two-story addition with stairway and rear deck dating back to 1986, though this permit ultimately expired. In 1987, a prefab fireplace was added to the third floor. More recent maintenance issues have primarily involved exterior matters, including a 2021 sewage backup incident and various 2019-2021 public space maintenance calls, though these are not directly related to the building's structural or safety systems. The property has maintained an active status with regular inspections and has generally addressed violations and permit requirements, with most recent permits focusing on compliance corrections rather than substantive building modifications.