1421-1423 9th Ave, San Francisco, CA 94122

The property at 1421-1423 9th Avenue is a two-unit, two-story multi-family residential building located in San Francisco's Inner Sunset neighborhood. Built in 1908 and currently owned by Chen Pei Yee, this flats and duplex structure has undergone several significant improvements over the past decades.

Most notably, in 2008, substantial upgrades were made including the replacement of ten windows in Unit 1421 with double-paned, energy-efficient wood clad windows, along with the complete replacement of wood shakes on the front and back of the building, costing approximately $30,500 combined. Earlier maintenance work from the early 1990s addressed termite issues, including structural reinforcement above a sliding glass door in 1993, while electrical infrastructure improvements were completed in 2004 and 2007, including panel upgrades and grounding work in accordance with Rule 20 requirements. The building's exterior environment has experienced periodic issues with graffiti and unauthorized postings between 2011 and 2019, primarily affecting utility poles and MUNI infrastructure, though these were consistently addressed by city services.

Recent activity includes two parking enforcement calls regarding sidewalk violations in 2024 and 2021 near the property. While the building has maintained its structural integrity through various maintenance works, most issues have revolved around exterior urban elements rather than building-specific concerns. The most recent documented building improvements were focused on energy efficiency and structural maintenance, with no significant building-related complaints or violations recorded in the past several years.