Steven Roth had this to say about 220 CPS:
http://dcrealestate.citybizlist.com/...SlsEoY.twitter
"We hear that the 1,000 foot tall, direct park-view apartment tower under construction on 57th Street is pricing at $6,500 per square foot. Our 220 Central Park South site, just down the block, is better."
If this one is super skinny--which would make sense if Roth & Barnett make some kind of compromise re: blocking future views from 225 W57th--it could rise much taller than 550'. This building had 240k SF of FAR back in '06 (some have mentioned the lot has come to include more properties/FAR?), and 105 West 57th is tentatively 670' at 105K square feet.
Barnett also controls 225 West 58th, where Extell proposed an 18-story 66K SF residential building a few years ago. Some kind of deal would do well to benefit both partners, especially if Barnett can ensure his views stay maximized (and Vornado's tower gained air rights to 300k total feet). If that occurred, something in the 700' range could happen I think. The Central Park panorama may be better than that of the WTC come 2020, with this, One57, 105 W57th, 432 Park, and possibly Torre Verre & 225 W57th all complete by then.