It is an abandoned two-story hotel and conference center that has limited structural damage. It is a medium-sized building with only one interior cell. The building is occupied by raiders.
Immediately to the southwest of the hotel there is a bombed-out building that serves as a post for one additional raider. The building is littered with traps. There are frag mines covering the area leading to the side entrance and tripwires that set off rigged shotguns, bear traps, a girder on a chain, and a pitching machine. There is also an automated turret on the top floor. On the third floor are four safes, three first aid boxes, one locked footlocker, a workbench, a bed, a raider, and some .308 caliber rounds.
When the player leaves and comes back, one raider sniper will usually take residence on the top floor. The lab table is set on top of two safes, one that is locked and one that is open.
The player enters into an imposing grand lobby that includes two (non-functioning) grand water fountains and a dozen pillars reaching toward the ceiling. There is also an elevator on the opposite side of the lobby, however the elevator is inaccessible. This elevator seems to have no purpose whatsoever. There are also the remains of victims of the raiders hanging from said ceiling and found elsewhere in the hotel. There are some rather gruesome torsos in the lobby which the player can grab/move, which is a rarity. Upstairs there is another large lobby/meeting room, several Nuka-Cola vending machines and a set of six well-furnished suites.
- 1 Duck and Cover! in the southern-most area of the hotel. After proceeding into the large room upstairs, head back downstairs, past the room with the pool table. It's on a wooden bookcase near a fire hose box.
- 1 Guns and Bullets in the large room upstairs, atop an L-shaped counter along the northern wall of the room. The room is east from the entrance through a set of double doors.
- 1 pre-War book on the same L-shaped counter mentioned above.
- 1 Nuka-Cola Quantum behind a locked door, behind the same L-shaped counter. The door and corresponding terminal are average locked. The Quantum is in a wooden crate on metal shelves down and to the left.
- In a room with two beds (1 usable and 1 not usable) and an overturned refrigerator, there is an easy lock safe behind a moved bookshelf that should contain a laser pistol and a few other supplies.
- To the south of the Alexandria Arms' doorway, inside a fenced area, there is a spawn point for Enclave soldiers. A vertibird will spawn and drop 2-3 soldiers, who often clash with the adjacent raiders. The encounter respawns every 72 in game hours.
- Just outside the entrance is a random encounter location.
Alexandria Arms appears only in Fallout 3.