139-141 Duncan St, San Francisco, CA 94110

The two-unit residential building at 139-141 Duncan Street in Noe Valley, owned by the Jefferson Ki-kuo Yih Revocable Trust, is a two-story flats and duplex structure built in 1900. The most significant improvement project occurred between 2001-2004 when a garage was constructed under the existing house, with various electrical installations and modifications following, including garage door motor installation and multiple electrical circuit additions.

This project had a total estimated cost of $115,000 and was completed successfully. The building underwent some maintenance work in the early 1990s when repairs and replacements were made to address wood-related issues in the back porch area. More recently, the building had one documented emergency incident involving a carbon monoxide detector activation in 2021, though it was determined there was no carbon monoxide present and no injuries were reported.

The property has experienced recurring issues with vehicles obstructing the driveway and parking violations in the surrounding area, with several reports of abandoned vehicles between 2018-2023, though these were consistently marked as "gone on arrival" by responding officers. While these parking-related incidents don't directly impact the building's condition or safety, they may affect resident convenience in accessing the property. The building's permit and inspection history suggests regular maintenance and improvement work has been performed, with no major structural or safety violations recorded.