Well, that's standard for all alterations. First, the landlord has to approve the alterations. Second, the tenant has to pay for it. Third, the tenant agrees to pay to change it back. That's obvious, because what landlord wants to deal with your purple walls with pink polka dots? However, in most cases, if the alterations are beneficial, I may consider it a fixture, in which case it becomes legally part of the property and not removed.Apparently the law says you must put up the money too for having it removed if you move!