I believe this is in the Hyatt downtown. It is a very elegant restaurant. It is on the 21st floor on top of the hotel and is a rotating restaurant. My advice would to get there about half an hour before sunset and get a window seat. When I went, we sat next to the window and were able to overlook the city as the sun lit it up. It was amazing watching the sun slowly set from our seats. The glass is a little tinted, so the sun doesn't hurt your eyes, and once the sun goes down, the city just lights up before your eyes.
The food is good, but look to spend over $100 there. The server was very friendly and helpful. There is good wine, and the desserts are really good.