
The Residential Master key can be beneficial to get you an extra look in ARC Raiders, but you'll need to find the item first.
It's a challenging task to get keys that are not part of a quest, as you'll have to depend mainly on your luck. Firstly, you'll have to search in the right spots. This guide will highlight the correct location and where you can use the Residential Master key in Buried City.
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How to get the Buried City Residential Master key in ARC Raiders
The Residential Master key can be obtained from the Dam Battlegrounds map. I managed to get one from Ruby Residence, but after several retries. This particular building has a cabinet that spawns random keys. If you're lucky, you could end up finding the Residential Master key from here.

Another great spot to look at is the Research and Administration building. You can spawn here, and a container on the second floor is a great place to look for random keys. You could also end up getting keys to other high-tier loot areas like the Confiscation Room and the Village areas in Blue Gate.
How to use the Buried City Residential Master key in ARC Raiders
Once you have obtained the key, head over to Buried City. The Residential Master key can be used in the Grandioso Apartment in the southern part of the map. I have marked the location to make it easy for you to find the spot.

You'll find a broken window on the ground floor to enter the building, and find the room on your left. Use the key to gain access to all the loot available in the room. This area has plenty of ARC enemies, and you should actually try to hide and avoid them as much as possible. I have also encountered a few Raiders at this location, so that's something to keep in mind.
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