Rarely does a property combine this level of raw upside potential with panoramic southwestern views. High on quiet, winding Sussex Street - located in one of the world's coolest neighborhoods as declared by Time Out® - this midcentury gem sits on a widely-desired lot. The property uniquely backs up to Penny Lane, a historic 19th-century carriage path turned secret alleyway, giving it an undeniable, only-in-San Francisco charm. Inside, the home remains in largely original condition, serving as a blank canvas ready for modern revitalization. The main level offers a solid foundational layout with two bedrooms, one full bath, living room with fireplace, and a spacious eat-in kitchen. The real value, however, lies in the exceptional expansion capacity of the lower levels. At street level, the one-car garage connects to a workshop area and a versatile bonus room - prime square footage easily reimagined as a future primary suite. Below that, a cavernous, unfinished lower level reveals massive ceiling height and direct access to the yard, offering a seamless footprint to build out a spectacular family room. Bring your architect, your builder, and your measuring tape. This is a premier opportunity to capture substantial equity and design a masterpiece from the ground up.