It is a rack on your car/truck right? If so the appartment manager or anyone else remoc=ving it is theft plain and simple. There is a slim chance I am wrong, but I very much doubt it. Check with your local police station and while you are there get the threat of theft and vandalism on record. Also find out what they would do about it if the theft does take place.
Remember on things like this it is not if you are right or wrong, but how the local government entity feels about it. Whoever has the police on thier side wins the war of resources.