This is a mod of set 7498 (Police Station) radar from 5985 (Space Police Central) and the cell design from the LEGO Movie set 70815. (Super Secret police Dropship) I included this drop-ship and and two of the patrol car from 70802, (Bad Cop's Pursuit) to complete the scene.
The exterior of the base features two holding cells and a repair garage capable of fitting a police patrol hover car (or two) from set 70802 (Bad Cop's Pursuit) with just a little room to spare. The top of this garage is meant for a 70815 (Super Secret Police drop-ship) model to sit. The interior of the base features three floors of details, and a fourth level of the emergency hover car landing station.
Without the vehicles. As you may have noticed, their are diagonal window spots that are missing parts, specifically this part in white is needed in three places: www.bricklink.com/v2/catalog/catalogitem.page?P=28327&... also, the words "PRECINCT 113" go on the exposed studs above the garage in printed 1 x 1 tiles.
The front door slides to the left and right, with the resulting opening being just barely big enough for the patrol cars to get through, while the drop-ship has to fly overhead.
The holding cells are removable for loading into transport vessels such as drop-ships. They also open up as seen here.
The lowest level is the lobby and garage. The two patrol cars can fit inside the garage with just a little bit of room left to spare.
The second level is for booking criminals and lower-ranking officers. After booking, they are either transferred out of to an asteroid prison somewhere in between Jupiter and Mars. The prison cells on site are for only for emergencies or when the subject is on their way to court.
The third level is for the Police Chief commander and his immediate subordinates, the detectives. Also up here is the water cooler and coffee maker. (Even in space, people need their caffeine fix!)
One of two stock models of set 70802, (Bad Cop's Pursuit).
The two engines are OCTAN-brand fusion reactors.
The fold-out weapons are quite well hidden on the patrol cars, in contrast to the frighteningly heavily armed drop-ships.
My singular set 70815 (Super Secret police Dropship)'s hover pods rotate backwards to give the illusion of flight. (although I forgot to turn them before taking this picture!)
One of the prison cells goes in the belly of the ship behind the rear door.