When I bought my shop (it came with a house and a garage for my wife) the PO had a 4 post lift in there. It was not bolted down (if it were bolted down, it would have been legally mine as part of the property and I would not have had to negotiate for it) The PO wanted to get stupid money for it and I would not play that game. The lift started out in the garage (30'x 30' with 12' ceilings, but only a 4" concrete floor) and he and his family rolled it over to the shop (2 bays each @ 20' x 20' with 14' ceilings and the concrete floor is 18" thick). So I know I will have no problem bolting it down. I had to spend money on the house and her garage, so I am still saving a little here and there for my lift... So now we work on the ground floor.