Keep in mind your closing costs which will include your Attorney fees, Application and credit check fees and perhaps proration fees as well. In a new building scenario, you will have thrust upon you the NY State and City transfer taxes along with your contribution to the new buildings' reserve fund and possibly the developers Attorney fees as well.
I would hazard a guess to say most on this thread would look to have you purchase sooner rather than later (3 years?) and I consider myself to be in that group. There is much to know. My question is, do you currently live in NYC? If so, good. If you are a foreign buyer, you will need additional advise in moving forward. It's not for lack of available properties but be aware in New York property sells in a heartbeat an inventory is extremely tight to begin with which will exhibit itsself by multiple offers on any property and even the dreaded bidding war. As I like to say, if you're not first in NYC, you're last Good luck.