As long as landlords comply with their state`s landlord-tenant laws, they can include any clause they like in a lease. And some owners add strange things. Here are the eight things to look out for when preparing to sign a lease: Just because it`s common to live with roommates in apartments and rental houses doesn`t mean all landlords allow it. Even if you sign the lease with a roommate, there may come a time when that person will move and you will want another roommate to move in. Don`t assume this is okay, as many landlords want to approve new roommates – or not allow them at all. Find out in advance about the applicable rules and make sure they are specified in the rental agreement. .