This is your opportunity to transform this property into something truly unique. Located in Old South San Francisco, this rare find offers two distinct single-family homes on one lot, providing endless possibilities for investors, contractors, flippers, or families. Nestled in the iconic Old South San Francisco, this property is steps away from vibrant downtown; amenities, including restaurants, shops, and the bustling business district. 1/2 a mile from Sign Hill Park; Convenient access to SSF BART, CalTrain stations, major commute routes, and San Francisco International Airport (SFO). 670 Grand Avenue features a spacious 2-bedroom, 2-bathroom layout with an open floor plan, a fireplace, and a eat-in kitchen. The finished basement provides additional living areas, storage space, and the home includes an attached one-car garage with a laundry area. 671 4th Lane offers a flexible living arrangement with ground-level living areas and a separate rear entry, making it ideal for rental potential or private use. Please note that the property is being sold strictly as-is. Buyers are encouraged to conduct due diligence to verify square footage, usage, and property status, as well as to consult the City of South San Francisco regarding building requirements and zoning options.