4000 rooms is monstrous. Some quick Wikipedia research says that this hotel would roughly be one of the 10 largest in the world (by room count) and easily the largest in Orlando. Heck, it's the largest in the Western Hemisphere outside of Vegas.
There's going to be more to this. Whether it's an indoor CityWalk or transit or something, there's going to be more. You can't add this many rooms without some serious infrastructure to support them. That means more restaurants, more parks, more transit.