Business travelers beware!
I've stayed at this hotel many times and am a preferred SPG member, but it simply no longer qualifies as a 4 star hotel. The staff is woefully untrained, the management absent, and the rooms are substandard, at best. Even the new tower is full of creaks, groans and noises (HVAC related) that the staff refuses to acknowledge, much less repair.
I am in a hotel room at least 3 nights per week and this one is horrific. If you want a good nights' sleep, choose the Marriott across the street, or splurge on the Ritz. This hotel is no more than a 2 star and and likely only a 1. 
As you can see by my comments, I never criticize hotels, as I believe most of them try very hard to make the life of a business traveler comfortable. This Sheraton, however, is truly terrible.