156-158 21st Ave, San Francisco, CA 94121

The 2-unit residential building at 156-158 21st Avenue, located in the Lake-Presidio neighborhood, is a two-story flats and duplex structure built in 1921 and currently owned by the Lee Trust. The building's maintenance history reveals a pattern of sewer-related issues, with eight documented sewage backup incidents between March 2018 and October 2021, including multiple occurrences in 2019-2021 where grease accumulation in the lines was specifically noted as a problem.

These incidents, all involving the 4-inch sewer vent line, were each addressed through completed Maximo Work Orders. The building's window infrastructure has received attention, with two documented window replacement projects: one in 1990 and another in 2001 that included the installation of glass brick and double glass windows not visible from the street.

Most recently, in April 2024, there was one parking enforcement call regarding a black SUV on the sidewalk, though the responding officer was unable to locate the vehicle. While the building has a relatively long history of sewer issues, all reported problems have been systematically addressed through proper channels. The window replacement work completed in the 1990s and early 2000s suggests proactive maintenance of building components not readily visible to the public.