Attic Self Storage is a single location facility ― not part of a chain. We are extremely proud of our over 35 years of service to Potrero Hill, San Francisco consumers. We know there is a difference, and we've been making that happen for years.Our spacious and unique is the former home of Hamm's Brewery. Converted to storage in 1976, the facility has over 1500 units on 4 floors with a heavy-duty freight elevator. Our carts and private parking lot make access to your Potrero San Francisco self storage unit easy and .