4470-4472 17th St, San Francisco, CA 94114

The multi-family residential building at 4470-4472 17th Street in Corona Heights is a two-story structure built in 1971 containing three units. The property has undergone significant recent improvements, particularly regarding fire safety, including the installation of a new fire sprinkler system for the ground floor ADU in 2022 (with ongoing work as of 2025), and a comprehensive upgrade to the fire alarm system in 2023-2024 to comply with current fire code requirements.

In 2020, the owners successfully legalized an existing ground floor ADU, though this process followed an active complaint investigation in 2019 regarding an unpermitted dwelling unit. The building has seen substantial interior improvements over the years, including kitchen and bathroom remodels in 2012, window replacements, and HVAC upgrades (including the installation of new furnaces in 2013 and a mini-split system in 2023).

Recent concerns have emerged regarding the property's exterior conditions, with multiple 311 calls in early 2025 related to garbage, debris, and graffiti on the property. Additionally, there was a previous issue with short-term rentals in 2019-2020, with neighborhood concerns about unauthorized rentals in a possibly illegal unit, though this appears to have been addressed with instructions to cease short-term rentals and switch to 30-day minimum stays. The building's maintenance record shows regular upkeep of essential systems and infrastructure, though the presence of an active building complaint from 2019 regarding an unpermitted unit suggests some historical compliance challenges that have required resolution through subsequent legalization efforts.