Time Out says
In the bizarre absence of a hotel near the Los Angeles Convention Center, this five-tower, 35-story, 1,400-room monster does decent business. Certainly, it looks the part: the huge lobby features a central bar that specializes in coffee during office hours and alcohol when day turns to night. Several restaurants provide other opportunities for visitors to fill up their expense accounts. The rooms are unremarkable but comfortable; needless to say, the views are terrific the higher your room. The pool's a good size, though you'll need a map to locate it.
Westin Bonaventure 404 S Figueroa Street
at W 4th Street