Permits have been approved to transform a single-family lot to contain four units at 2967 23rd Street in San Francisco’s Mission District. The construction involves adding a vertical addition to an existing single-family residence and building a new four-story two-unit place on a currently vacant portion of the lot. The new housing will do a small part to help capture demand for one of the city’s most distinctive neighborhoods. Kieran Woods Construction is the owner and contractor for the project.