A cosigner is a person with great credit and income who can vouch for you. Social Security Number (SSN): Landlords can ask for an applicant's SSN for the purpose of running a credit check or background screening.As part of how to fill out an apartment application, landlords need to run a background check and credit check on prospective tenants. Most landlords require a minimum credit score in order to consider a potential tenant. A landlord credit check helps determine if you're likely to pay rent. The average credit score for approved apartment rental applicants is around 650, whereas the average credit score for rejected applicants was 538. Our screening process is not just based on a credit score only - we take a comprehensive look at the overall applicant. Most landlords will run a credit check while reviewing your application, and a low credit score may come across as a red flag. Not all landlords and property managers do credit checks online. Renters in Riverside, CA usually need to provide proof of income, a credit check, and references.