According to the article the renters were offering at least $100,000 to move out. I think that is extremely generous as they are renters and don't own their units. I haven't heard of any renter being offered that much to vacate.
What I am really shocked about this development is that selling prices for these rather mediocre condo units are over $800/sq.ft.
I doubt there is a huge demand for this kind of product at this price especially when the market is returning to more realistic and sustainable level. The developer is heavily banking on the mystique of the Sutton Place, but the new building has stripped all of that history and charm behind all of their pretensious marketing.