The Spa at The Bellevue Hotel
The spa at Hyatt at The Bellevue is referenced by reviewers writing for major publications. Of the 9 professionals tracked on TripExpert, 4 acknowledged the spa, including Fodor's, Gayot and Frommer's.
The Bellevue Hotel 
Fodor's
Gayot
Frommer's
Star Service
Fodor's "The spacious rooms, done in bright prints, have large walk-in closets and the high ceilings and moldings typical of older buildings; suites, updated in 2012, juggle the building's Beaux-Arts heritage with contemporary touches"
Gayot "The Park Hyatt's Sporting Club is free for guest use, and spa treatments are also available"
Frommer's " These days the rooms are run by Hyatt, which keeps up-to-date with spacious rooms, goose-down duvets, and a full-fledged Sporting Club in lieu of the usual tiny hotel fitness room"
Star Service "For now rooms are decorated in American Empire style with federal reproductions: large armoires hiding minibars and flat-screen TVs with DVD players, large dedicated desks, phones with voice mail and data ports, and spacious sitting areas with sofas and period chairs"
