An owner can manage their own property...let that go. Return of security deposits are covered by Civil Code Section 1950.5. That section provides in relevant part: No later than 21 days after a tenant has vacated...the landlord shall furnish the tenant by personal delivery or by first class mail, an itemized statement...indicating the basis for [any deductions from the security deposit]...and shall return any remaining portion... The amount deducted for cleaning must be reasonable to...