Great question. I was doing the research on the data and was looking at the answers and Ed beat me to it. A few points about negotiating this type of property. There are some unique challenges if I was representing you in the negotiations.
1) You have a really specific property in mind. It is also a very unique property and address. Daniel Libeskind knows it, you know it, and all your friends will no it as well. This makes negotiations difficult.
Dealing with a builder directly poses challenges as well. It is much easier for us to negotiate if you are looking for a specific type like luxury property like a 2br/3ba between 1800-2200 sq. ft. and you are willing to look at Spire and other places.
2) Price sq. ft. is not always the best indicator on a property like this. A few factors.
a) smaller units normally have a higher price per sq. ft.
b) I think views and which level are you on have a lot to do with it
c) This I am sure of, is the parking places included with the unit. Make sure your price sq. ft. calculation has this accounted for
3) There have been no sales this year. This is what I'd base the negotiation strategy upon.
I would love to represent you on this transaction. This is a showcase building and super cool. Also my favorite part of the real estate transaction is the negotiation by far. My least favorite part is the driving around and looking at houses (although the really cool ones like yours are the exceptions :). I do negotiate on my commission when the buyer has the property picked out as well.
Good luck. I think there is a 70% chance you are going to try to do this yourself without an agent, and my advice is start low and tell them you would like a counter.
Let me know if I can help
Mike Henderson - Realtor