As the owner/landlord of one or more apartments, it is imperative that you have a properly drawn up apartment lease that specifies all of the terms that you wish a tenant to comply with while occupying your property. There is much more to an apartment lease than the amount of rent you will collect each month. As a property owner, you want to protect your property as best as possible. Yes, you can ask for a security deposit, but if you get a crazy tenant, they can cause much more damage than the security deposit will cover. One very important thing to specify is the number of people allowed to occupy your apartment. Having 10 people in a 2 bedroom apartment is a recipe for disaster.