20 Niagara Ave, San Francisco, CA 94112

The two-story, four-unit multi-family residential building at 20 Niagara Avenue in the Outer Mission neighborhood was constructed in 1964 and is currently owned by the Michael A Bagatelos Revocable Trust. The property has undergone several significant improvements over the past decade, with the most notable being comprehensive window upgrades in 2011-2012, which included the installation of 36 new dual-pane windows in various locations (front, lightwell, and back) to meet energy efficiency requirements, costing approximately $20,000 in total. The building faced several safety-related violations in 2001, including issues with fire extinguisher maintenance, gas meter instructions, gas shutoff tools, and smoke detector placement at stairs, all of which were addressed and abated by April 18, 2001.

A routine inspection in 2008 identified fire proofing concerns that were subsequently resolved. Recent activity at the property has predominantly involved external maintenance and compliance matters. The building has received multiple 311 calls between late 2024 and early 2025, primarily related to parking violations and sidewalk access issues, though one complaint from December 2024 regarding abandoned furniture was confirmed to originate from the property.

A tenant buyout was recorded for a unit at 37 Niagara Avenue in December 2024. Regular housing inspections have been conducted periodically, with the most recent routine inspection occurring in 2011. The building's maintenance history demonstrates compliance with required safety updates, particularly regarding window installations and fire safety requirements, though some noise complaints related to construction work were noted during the 2011 window replacement project.