Presumably the garage door was up to code when the home was built, not required to upgrade the garage door when the code is later changed. In any event it is a rental, as I recall. The responsibility for upgrading the garage door would be with the property owner, not the tenant.
With no gasoline powered vehicles, yard tools or stored gasoline in the garage the only appreciable risk, unless you believe electric vehicles routinely combust, is of mice, other pests entering the home while the door from the garage to the hallway is open. If you leave the door from the hallway to the garage open while charging a vehicle parked inside the garage there should be no issue. (Using the Wall Connector is no different than if you plugged the Tesla Mobile Connector into a receptacle that happened to be located in the hallway and charged the Tesla vehicle.
If this is a rental property any improvements made to the property technically become a permanent improvement to the home (check local regulations concerning rentals.)
With no gasoline powered vehicles, yard tools or stored gasoline in the garage the only appreciable risk, unless you believe electric vehicles routinely combust, is of mice, other pests entering the home while the door from the garage to the hallway is open. If you leave the door from the hallway to the garage open while charging a vehicle parked inside the garage there should be no issue. (Using the Wall Connector is no different than if you plugged the Tesla Mobile Connector into a receptacle that happened to be located in the hallway and charged the Tesla vehicle.
If this is a rental property any improvements made to the property technically become a permanent improvement to the home (check local regulations concerning rentals.)