Holding Deposits
If you apply for a unit, a landlord may charge you a deposit of up to 25% of one month's rent, to hold the unit while screening your application and/or as security that you will move in once you've been offered a rental agreement. Holding deposits require a written receipt that clearly describe the terms. A landlord cannot keep a holding deposit if you fail the application screening or the rental unit fails a housing inspection. However, if you change your mind about renting the unit, you will likely forfeit the holding deposit.
See the state laws for holding deposits.