has a slot 104 dimensioned to allow door hasp 900 to pass through hasp 900 has a notch 106 formed therein and aligned with door hasp lock mechanism 103 when over lock 100 is in the closed or locked position door hasp lock mechanism 103 is lowered into notch 106 so that door hasp 900 cannot be removed and thus prevent the opening of door 700 when over lock 100 is in the open or unlocked position door hasp lock mechanism 103 is disengaged from notch 106 and thus allows door hasp 900 to be moved and thus allowing the opening of door 700 lock status alarm 200 if provided uses a magnet 105 to detect the position of door hasp 900 in reference to door hasp lock mechanism 103 magnet 105 is used by over lock control unit 400 to monitor the position of door hasp 900 and to emit an alarm it will be obvious that other methods to detect the position of door hasp 900 could be used such as hall effect sensors lock status indicator 300 is mounted on the outside of storage unit 10 and contains indicators such as light emitting diodes leds lamps or other devices to indicate whether door 700 is open or closed lock status indicator 300 interfaces with over lock control unit 400 to provide real time status display of over lock 100 positioning computer 600 can access database 500 of units authorized users and their accounts to determine if storage units 10 are rented or not and if rented whether the account is delinquent or not if 1 storage unit 10 is not rented or 2 a storage unit is rented and b the account associated with that unit is delinquent over lock.