@Simka - FYI, that XKCD comic applies to you as well.
Someone reminded me recently that the early buyers in a new build often have a harder time getting a mortgage since there is a lower owner occupancy rate, and when they get one, higher rates. Which is why it's not uncommon for early buyers to get a discounted price. (I assume that applies to conversions as well.)
I'm unclear how long the units on the market have been available. At some point though if they aren't moving, renters who want to buy their units may be able negotiate a further reduction in the insider's price. If the developer has misjudged how hot the Jackson Heights market is, getting current renters transformed to owners will make selling the renovated apartments at asking or above easier. Of course, inventory in Jackson Heights is kind of low too right now, so if there is a pent up demand for apartments, renters hoping to play chicken with developer on price could lose.