In short

Room Key Equipment Store East is a room key for the building “Equipment Store: East” in Downtown. It opens: locked room. Behind the door: 2 large safes, 3 cabinets, 1 computer. The key fits only this place.

KeyBuildingDistrictOpens
Room Key Equipment Store EastEquipment Store: EastDowntownLocked room

Where it is

The building is on the interactive map. All keys, doors and safes of the city: Locked doors, Safes and containers, the key guide.

The game data does not list where this key drops or is sold, so we do not guess.