if the garage's are council owned they maybe able to tell you.
a little trick i use when im trying to locate a land owner for shooting permission is to park your car up in full view and hang about in a "suspicious" manner, local people soon notice and in no time at all you can be sure the land owner will turn up to find out what your upto ( beware as the police showed up once when i done this lol)
im sure if you hang about for a while near the car a concerned local will show up and you can then quiz them to find out what they know.