Vacant

Vacant is a multiplayer map available in Call of Duty 4: Modern Warfare and Call of Duty: Modern Warfare 2 in the Resurgence Pack DLC. It is a small map that is set in an abandoned office building. The main building contains various pieces of office equipment, cubicles, and random debris lying around. Attached to the main building is a warehouse, which connects to the main office area. Outside one can find multiple destroyed vehicles, abandoned shipping containers, and a large oil tank. The map plays host to intense close quarter battles, due to most of the map being indoors, with the outdoor areas usually serving as flanking positions.

Tactics

 * Since most of the map is Close quarters combat, shotguns and SMGs are generally favoured, but LMGs and Assault rifles can prove useful in the outdoor sections of the map.
 * A well thrown grenade can take out multiple enemies, due to the closeness of the hallways and the lack of area to escape to. A RPG-7 or Grenade Launcher could be used just as effectively.
 * Woodland Camouflage and Digital Camouflage are the most useful, but Blue Tiger Camouflage can work decently as well.
 * Despite airstrikes seeming near useless, a well placed airstrike can still kill, as there are holes in the roof of the building, most notably the warehouse.

Domination
Flag locations
 * Flag A - At the SAS spawn point, between the shipping containers and the oil tank
 * Flag B - The outdoor area in the middle of the office complex
 * Flag C - At the Spetsnaz spawn point, at the very back of the computer room

Headquarters
Possible locations for the HQ
 * In a shipping container to left of the SAS spawn point
 * On a cubicle in front of the Spetsnaz spawn point
 * The outdoor area in the middle of the office complex
 * The metal shack to the north-west of the map

Search and Destroy
Locations of the Bomb Sites
 * Bomb Site A - At the entrance of the warehouse
 * Bomb Site B - Left of the Spetsnaz spawn point

Call of Duty 4: Modern Warfare

 * When the player spectates outside the map and look at the sides of the buildings outside, there are weird and kind of disturbing graffiti paintings of cartoon characters. They look a bit like the cartoon band Gorillaz.
 * There is a poster on a wall in one of the rooms depicting a World War II-era female Russian soldier that is strangely wielding an American Thompson, which the Russians never used. This picture may also be seen in the MW2 single-player map, Loose Ends.
 * There is a Truck parked outside of the warehouse with a license plate "R3TARD0"
 * An Intel laptop can be found in the office area.
 * If the player stands still long enough in the office area the sound of a fan clicking can be heard, someone talking somewhere on the map, and footsteps. This is all heard above the action music.
 * The apartment buildings around the right side of the building (outside the map) don't have any collision effects. If a chopper is called in, it is not uncommon for it to go near these apartment buildings and for at least part of it to phase through them.

Call of Duty: Modern Warfare 2

 * On the sides of some of the green shipping containers, one can see a stylized logo of Captain Price's face smoking a pipe. Below the face it says, OSCAR MIKE'S SHIPPING COMPANY, followed by, WE ARE ALWAYS ON THE MOVE.
 * The gate separating the back office (Spetsnaz spawn) and hallway is removed when playing Demolition. It is perhaps the only map to feature a piece of terrain that is not in every game-mode.
 * The map itself is much brighter, having less of a gloomy feeling, possibly due to the lack of Night Vision Goggles in Modern Warfare 2.
 * If the player goes far enough out of the map in Spectator mode, they will be able to see the background picture is of Prypiat, Ukraine.
 * If you travel out of the map (via spectate) you can see Vacant is located by Chernobyl, you can see the factory in the distance and if you go into spectate you can see they left the building where you have to go to the hotel at the end of All Ghillied Up.
 * Speculated belief of why it is no longer gloomy is the lack of cloud cover and it has flowers blooming all around the map suggesting spring.
 * In MW2, the color scheme from Vacant has been changed from green in COD4 to light brown, which accounts for much of the atmosphere.
 * It is unknown why the US army rangers are in Russia, where Vacant is located. This may be down to the fact that the stimulus package had more Task force maps than Army rangers.
 * The main corridor has beams of light, sometimes blocking the players vision.
 * In domination; if the enemy has just taken A; shoot at the fuel tanks near the flag, when it blows up you will definitely get a number of kills.

Call of Duty 4: Modern Warfare vs. Modern Warfare 2
thumb|300px|left|Vacant Comparison between Call of Duty 4 and Modern Warfare 2