In California, you'll need to fill out a form that covers your rental and employment history, income details, and references. A completed application form per adult - your application can be applied to one property at a time.Once you find an apartment you like, the next step is to fill out a rental application. Who Should Fill Out An Application Form in California? All prospective tenants over the age of 18, applying to a property, should fill out a rental application. Before renting to you, most landlords will ask you to fill out a written rental application. Written screening criteria will help rental property owners attract qualified applicants and quickly identify applicants who do not qualify. A California rental application enables landlords to collect information on tenants before entering into a rental agreement. This is a tutorial on the residential lease or month-to-month rental agreement. Breaking a lease is very simple.