Farnborough, Hampshire, has a private, exclusive roof-top car-park that can only be accessed by foot (or helicopter)
It has been like that for the last 5 years, and both residents & council are utterly brassed off about it:
Just to add extra bizarre details, Gareth Lyon from the Rushmoor Borough Council told Adrian Chiles of Radio 5 Live that he had been contacted by local parents after they received threatening letters from the building management. Their children had been stopped from playing football in the car-park, and the letters said that their children might damage cars parked in the bays (the only means of access is stairs, or a lift that might be able to accommodate a bicycle).
There is currently a gym under the car-park. The block was built in 2010, at which point the developers ran out of money. There was supposed to be a residential block built next door, with an access road to the street from that block (on the right of the photo above; if you look closely, you may be able to spot the gap in the parapet where the bridge was due to join the car-park).
Farnborough residents are now deeply cynical, after 5 years of zero activity, that anything will change soon with their unique car-park (suitable for angels, only).