This might be the cheapest piece of real estate in San Francisco

Most properties in San Francisco don’t come cheap. But a small part of the Richmond District just hit the market asking just $35,000. Of course, there’s a catch.

A 7,200-square-foot alley at 81 22nd Avenue, just a block from the Presidio park, is for sale and it currently functions as a shared driveway that runs between a block of houses, according to the New York Post.

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“I assumed that these sorts of things were owned by municipalities,” listing agent Fred Glick told Curbed in 2015, when it first listed for $50,000. “But I was wrong.”

Still, it’s just an alley. Nevertheless, the listing says that the alley could make money — charging the U.S. Navy for airspace rights when the Blue Angels fly over during Fleet Week. [NYP] Christopher Cameron