1389-1391 21st Ave, San Francisco, CA 94122

The two-unit residential building at 1389-1391 21st Avenue in the Central Sunset neighborhood is a two-story flats and duplex structure built in 1938, currently owned by Zhong Johnny Chung & Ma Mar. The property has undergone several significant renovations and updates over the past few decades, with the most substantial work occurring between 2016-2019. In late 2016, a major renovation was approved to reconfigure the ground floor into a one-bedroom/one-bathroom family room with parking, while also relocating kitchens and converting dining areas into bedrooms on the upper floors.

This project was accompanied by comprehensive electrical work, including the installation of numerous fixtures, appliances, and safety features such as smoke detectors. The building's systems have been updated significantly, including a 200-amp service upgrade and the installation of three meters in 2017, followed by furnace replacements and plumbing renovations in 2019 to complete various previously expired permits. The property has a history of maintaining essential systems and responding to modern requirements, as evidenced by the 2019 completion of multiple permits for bathroom renovations, kitchen installations, and electrical upgrades.

Planning records indicate that there was an attempt to create an ADU unit on the ground floor in 2017, but this permit was withdrawn due to concerns about bathroom connections, indirect access, and unauthorized features like a sliding door to the backyard. Previous maintenance work includes window replacements in 1995, reroofing in 1992, and window repairs in 1986, though these are all older records compared to the more recent renovations. The only recorded 311 call related to the property was regarding an abandoned vehicle on the street, which was determined to be on private property and therefore had no merit against the building itself.