 Developed by Doug Manchester and owned by Host Hotels & Resorts, the taller tower is the tallest building on the waterfront on the West Coast, and with 1,628 rooms, it is Southern California's largest hotel.Because of its proximity to the waterfront, as well as its amenities, the Manchester Grand Hyatt is referred to as a spa and resort.The Manchester Grand Hyatt consists of two towers, the 40-story Harbor Tower built in 1992 and the 33-story Seaport Tower which was added in 2003.