revise procedures for returning and withholding security deposits for residential premises.

SB 4 revises South Dakota's rules for security deposits in rental housing, directly affecting landlords and tenants. It requires landlords to return full deposits within 21 days of lease end or provide a written explanation for withholding, limited to unpaid rent, damages beyond normal wear and tear, or costs to restore the property. Landlords must also give tenants an itemized accounting of withheld amounts within 45 days of request. Failure to comply results in forfeiting all rights to withhold the deposit and potential $200 punitive damages for bad-faith retention.