Wow---I had no idea such a thing existed. All the parking ramps I've ever been in are the traditional kind with...a ramp. This design is certainly a more efficient use of space.
My favorite parking experience is an open lot in downtown Chicago. You tell the attendant what time you'll be back, and the employees proceed to jam your car as far back into the lot as they can. If you come back earlier than planned, they have to move a dozen cars around to get to yours. One learns not to come back early, LOL.