2. For a privately owned monument or memorial on a locality's public property, such action may be commenced by the private owner of such monument or memorial. No locality or its officers, employees, or agents shall be liable for damages pursuant to this section when taking action pursuant to § 15.2-1812 except for gross negligence by a duly authorized officer, employee, or agent of the locality. Damages may be awarded in such amounts as necessary for the purposes of rebuilding, repairing, preserving, and restoring such memorials or monuments. Damages other than those litigation costs recovered from any such action shall be used exclusively for said purposes.