In ARC Raiders, the Residential Master Key is a valuable item that lets you unlock sealed apartment doors in Buried City, opening the way to high-tier loot. Unlike quest-specific keys, this one spawns randomly, so knowing where to look can save you hours of searching.
Where to Find the Residential Master Key
You’ll find the Residential Master Key primarily on the Dam Battlegrounds map. The best known spot is Ruby Residence, a multi-floor building on the northeastern side—just east of the Hydroponic Dome Complex and across from the Pale Apartments.
Head to the second floor and check every cabinet or computer desk. The key appears randomly inside lootable containers, so it may take a few runs before you get one. If you’re not lucky at Ruby Residence, try searching other nearby structures like the Research & Administration building. These buildings have similar loot spawns and may also drop other rare keys like the Confiscation Room Key or Village Key.
Once you’ve acquired the key, make sure to return to Speranza so it’s added safely to your inventory.
Where to Use the Residential Master Key
After obtaining the key, travel to Buried City—a partially buried urban zone filled with abandoned high-rises and dangerous ARC patrols. The Grandioso Apartment, located on the southern side of the map (east of the Town Hall), is the main location where the Residential Master Key is used.
You’ll spot a large broken window on the ground floor. Enter through it, and immediately turn left to reach a locked door. Use the Residential Master Key here to open it. Inside, you’ll find several loot containers filled with useful supplies and weapons.
All Loot You Can Find Inside
The Grandioso Apartment room holds one of the most generous caches in Buried City. You can expect a mix of ammunition, healing items, crafting materials, and even rare weapons. Possible loot includes:
- Ammo types: Light, Medium, Heavy, and Shotgun ammo
- Medical supplies: Bandages, Herbal Bandages, Antiseptics, and Shield Recharges
- Crafting materials: Fabric, Kettle I, Film Reel, and Bicycle Pump
- Throwables and gadgets: Snap Blast Grenades, Music Box
- Weapons: Tempest I (Epic-tier Assault Rifle)
The Tempest I is the standout reward here—a fully automatic assault rifle with a steady rate of fire and reliable performance in close-range fights.
Pro Tips for Key Farming in ARC Raider
- Spawn patterns are random: The Residential Master Key doesn’t always appear in the same building. If it’s not in Ruby Residence, restart the session and re-check cabinets and desks across the Dam Battlegrounds map.
- Stay alert: Both the Dam and Buried City areas are heavily guarded. Expect ARC enemies and Raiders patrolling these zones—avoid unnecessary fights when looting.
- Key usage is one-time only: Once you unlock a door with the Residential Master Key, it disappears from your inventory. You’ll need to find another if you want to open additional apartments.
Keys like the Residential Master Key aren’t just collectibles—they’re your ticket to early-game upgrades. Unlocking secret rooms can grant rare consumables and epic weapons that give you an edge against other Raiders and the ARC. Since the spawn is luck-based, farming these keys periodically is one of the most effective ways to stay stocked up and ready for higher-tier missions. Play Now!
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