Where an area of real property owned by this State is bounded by a wall, fence or other structure which has gates or other lockable entrances, the Office shall notify those ambulance, fire and police services which are nearest to the enclosed area of the location of such gates and entrances. The Office shall provide the ambulance service, fire company or police department nearest each such enclosed area a key to each entrance. For purposes of this section, the words “real property” shall include all improved land only and shall not include buildings.