I agree with Peter C and kiwipaul, but would add a couple of points for further consideration. As the door is an external one with a lot of use, the OC should get a heavy duty self closer and make sure it is installed and adjusted properly. The cheap little lightweight ones might suffice for screen doors and the like in a domestic situation, but are of little use in the situation you describe. About your neighbour who slams his door, as this door is fire rated it should also come with a self closing apparatus. If in proper working condition, it should be virtually impossible to slam that door. If he has tampered with the apparatus or disconnected it, he would most likely be in breach of the fire regulations. Worth getting the Managing Agent to check that out! These doors are all common property issues.