Property tax bill or statement. Records from a financial institution.All individuals over the age of 18 MUST fill out a separate application if they will be living on the property. The STRO Ordinance requires a license for all STROs of a dwelling unit, or part thereof, for less than one month within the City of San Diego. Check mark the TWO different documents below that you'll use as your proof of California residency. Home utility bill or cellular phone bill (Preferred) Two forms of California proof of residency. You must have two, different printed documents with your first and last name. A collection of all the forms and and documents that are posted on the San Diego Housing Commission's (SDHC) website, listed in one location.