If you need a real estate broker to help you with your sale, I will be very glad to help you buy it then rent it out for you, as I have been doing for many people living overseas.
check me out at http://www.creny.com
I am assuming that you are referring to the closing costs of purchasing a condominium unit. Here is a link that will give you a very detailed breakdown of the closing costs associated with purchasing a condominium unit, http://www.nycaptinfo.com/index.php?content=closingcost
If your question referred to the taxes you will have to pay when you go to sell the property. That's a question that a real estate attorney should answer for you because it depends on how you purchase the property and a multitude of other factors.
Depending on how you structure the transaction when you purchase, the selling costs will vary. The best way to approach this is if we can talk and I can help you understand the different outcomes depending on what your individual goals are with purchasing a condominium.
Please email me and we can have in depth discussion of your real estate goals.
Prudential Douglas Elliman
Web Reference: http://www.prudentialelliman.com/moe