4121-4123 20th St, San Francisco, CA 94114

The property at 4121-4123 20th Street is a two-unit, two-story multi-family residential building constructed in 1900, currently owned by Green Hills View LLC. The building has undergone significant work and faced numerous challenges since 2014, particularly related to its basement and structural integrity. In 2014-2015, the building experienced serious issues with excavation and water management, leading to multiple complaints about potential structural failure and inadequate shoring during rainy conditions, though these violations were ultimately abated in 2018.

Recent major construction work is ongoing, with permits issued in 2023-2024 for substantial renovations including basement remodeling, kitchen and bedroom relocations, and the addition of dormers. The property has been classified as abandoned at various times between 2018-2019, and as of 2022, there were reports of roof issues causing water damage affecting neighboring properties. Recent complaints in 2024 have centered around construction noise, though these cases have been marked as closed.

A notable code enforcement matter from 2018 regarding unauthorized wall covering work appears to still be active. Multiple 311 calls in 2023-2024 have addressed various issues around the property, including graffiti, blocked sidewalks, and construction-related concerns. The building's recent permits suggest ongoing substantial renovation work, with the most recent related to creating additional storage space and modifying access between floors, with a combined estimated cost of $770,000 for the two most recent permits.