I think this topic just goes to show that if you only tell us half the story, or mis-describe the situation, you won’t get appropriate advice.
@pmayes said:
… and is covered in a tarpaulin. I suspect it belongs to one of the other units.
If it’s covered in a tarpaulin, it is valuable to somebody. It is not abandoned, it is stored. At a guess, yes, one of the other units in your scheme. And, depending on what it is, it could be very valuable.
I would make a determined effort (and record the details) to ascertain who the owner is. A sign on the vehicle, a letter under the door of each unit, etc.
You may (after a suitable period of notice) have the right to move the vehicle (to a legal parking spot), but I would strongly suggest you do not dispose of it.
You have a property manager, and that person is not doing what you’re paying them to do if they have leased your property when part of it is not available for occupation.