I have to admit that grabbing private property so it can become someone else's private property bothers me a little for many ethical, legal, and financial reasons. My background is a little more financial so all I would say there is that it essentially violates and puts an unnatural somewhat political twist into the natural laws of supply and demand.
The legal issue I would be curious to see someone like Roy comment on.
I'm on vacation, so no long comments from me today, other than to say that this decision was pretty much mandated by the Kelo v. City of New London decision. New York could have said it had more restrictive condemnation (eminent domain) laws than the U.S. Constitution, but that was never very likely. There's some potential distinction, I guess, if the courts decided that this land wasn't blighted (like I believe it was in Kelo), but states have been taking land for a "proper public purpose" for decades. The definition of what is "public" and what is a "proper purpose" has traditionally been up for debate.
I do condemnation work for the State of New Jersey, and I can say that in the case of strictly land takings, we do a pretty good job about compensating property owners; there's a multi-step process that determines compensation, and it can include multiple hearings, appraisals from both sides, etc. We generally pay well over what our appraiser says the property is worth.
My bigger issues are when we take property from a business (as things like lost profits aren't compensated for adequately, in my mind), and when we take purely private land and give it to a private landowner (like the Kelo and Nets situations). It's a philosophical thing, but I think eminent domain should only be used for public necessities. Allowing the government to take anybody's land for any remotely justifiable purpose has the effect of ensuring that governments will not adequately pursue other alternatives.