I hope someone from the St. Regis is reading this and getting a kick about it. It all seems pretty straightforward:
The OP booked a room, and was told a suite upgrade was not available. The hotel, after having a bluff called to a certain extent, responded positively by further upgrading the OP to a 1,000sf corner suite as a gesture. End of story? Hopefully. Also, how hard is it to place a phone call to the hotel the day before arrival politely asking for a suite upgrade to be blocked in advance?
My two cents are that the St. Regis Suites are not great suites, with relatively low ceilings and a cramped bathroom layout. I prefer the Metropolitan Suite, which, although smaller, has a lovely stone and marble bathroom and open plan living space.