How Do Leases Work? The lease is one of the important documents that you will need to fill out and sign before you can move into a new apartment. If there is a landlord who tries to get you to move into one of their units and does not provide a lease for both of you to sign, then this is a red flag and you need to take a look at some of the other options available to you when it is time to pick out a home. But if...