As you explore Dead Island 2, you’ll come across a side quest called The Death of the Party. This side quest takes you to Curtis’ mansion where you’ll find a gate that requires Curtis’ Garage Key to open.
Head between the garage doors on this building to find a switch. Press the switch to open one of the garage doors. Head inside and deal with the enemies. In the back, knock down the junk blocking a small path leading to the other side of the garage. Once it’s been cleared, crouch through the space. Curtis’ Garage Key can be found on the workbench.
