Jack Green REalty
A thorough analysis of this unit compared to the others would be in order to answer this question. If you are not working with an agent, I'd be happy to help. If you are, have him/her present comparable sales so you know.
While an offer of $210K seems to be in order for a listing priced at $215K (purely looking at the numbers), it could be a high offer and going in lower could save you money, based on comparable sales.
The link on Trulia provides sold data at the bottom of the page. You'll find condos that have sold from the low 200's to the high 200's in Bradley Beach.
Does your offer of 210K include a preapproval with some meat in it? How much down? Are you seeking concessions? What is your deposit? Who is doing your loan? When is the loan commitment date? When is the closing? Are you flexible about closing? Who is negotiating the terms for you? for the seller? All of these factors influence the final price that a seller is willing to accept.