The Hotel

The Survivors start on top of a hotel converted into a evacuation center, recently swarmed by the Infected. The Survivors witness the helicopters moving to a different location, and decide to follow them through the city. The Survivors become acquainted in an elevator and the Survivors must pry the elevator doors, making a loud screeching noise that summons the horde. Afterwards, they must fight through the remainder of the hotel, which is on fire.

Walkthrough
You start off on the roof with only a second pistol and melee weapons. After that, you head down a flight stairs and this is where you leave the safe area. (And when the Infected can spawn) You have two choices: you can go through the halls, or you can go on the ledge. Both have advantages and disadvantages. You can go room through room and find many useful items like Defibrillators, melee weapons, pistols, Adrenaline, pills, and Magnums. You may also find a Chainsaw in one of the rooms, making the nearby Crescendo Event much easier. After going down a long hall, you make a left, and right when you turn half of the hall erupts into fire, forcing you to go into a supply closet and then on the ledge of the hotel. Then you need to go down another hall. And when you reach the end you go down another flight of stairs. You find yourself going yet another hall. Finally, when you reach the end of the hall you, make a left and find yourself in a lobby. You then go into the open elevator and close the doors once everyone is in. While you are in the elevator, the Survivors begin talking and get to know each other. Once you reach the bottom floor, which is on fire, you have to manually open the elevator doors, causing it to make a loud creaking noise causing Crescendo Event. You can easily defeat the horde by either going to the back of the hall and defend there, or stay in the elevator. Remember to look for weapons outside the elevator. After that, you can go into a room with Chrome Shotguns and, possibly, a health pack. You then must go down a small hall that is on fire, forcing you to move into a kitchen. You have to jump over the metal table and head into the lobby. You navigate through the fire in the lobby to reach an open door that leads to the main lobby and ultimately the safe room.

Trivia

 * This hotel is featured in the Zombie Survival Guide trailer, when the Survivors are seeking to get to the evacuation center.
 * In the The Zombie Survival Guide the Survivors know each other at this point, although in-game they do not.
 * The hotel is on fire, which makes a horde scenario near the end difficult due to the screen being fogged up by smoke.
 * The burning hotel could be considered a reference to the Apple Inn Scenario in Resident Evil Outbreak, another zombie co-op game which takes place in a burning hotel.
 * It is possible for a Charger to instantly kill you by charging at you while you are by a window.
 * The beginning of the level is similar to the beginning of the original Left 4 Dead, in which the Survivors travel through the city to roof of a living complex only to see their rescue chopper leave them behind.
 * Judging by the dialogue made in the elevator, it is assumed that the Survivors only met each other moments before the intro video ended.
 * This campaign is interesting because of the fact that there are initially no Tier One weapons available to the Survivors—only melee weapons and pistols. The poster foreshadows this, since it shows the Survivors holding only melee weapons.
 * Just after you go down the first set of stairs, there is a large room to the right that seems to be a conference room. There are many maps all along the table, all showing that the Infection has engulfed Philadelphia and half of New Jersey completely, while it appears that most other evac locations have small or medium outbreaks. It is assumed that these maps were created in the early stages of the Infection, as the whole plot of the game revolves around reaching the cruise ships in the Gulf of Mexico, which are the only safe spots for Americans left, as the mainland has been completely overrun.
 * This is the first time the Survivors encounter the CEDA hazmat suit Infected.
 * It was at this campaign that the new Left 4 Dead 2 Survivors meet together. It is not known how the Survivors manage to get together, but it is possible that the Survivors followed the sound of the rescue helicopter and coincidentally crossed paths with each other since the start of the campaign at the rooftop which they curse the helicopter for leaving them behind.
 * If one can look behind the Survivors before the helicopter takes off, you can see that the copter was very close to the Survivors when it took off. The pilot would probably be able to see them, but was most likely not risking rescuing carriers.