Next, contact a lawyer. It sounds as if you've been moving right ahead with the purchase. I'm not a lawyer, so this isn't legal advice. But every interaction with the builder potentially weakens your position. And whether you can "come out of the contract" depends on what the contract provides.
Have you asked your real estate agent any of these specific questions that he should be helping you with? Yes or no, you should speak with your agent again because he is your representative and if he is not helpful, you need to speak with his managing broker.
Do you have any contingencies to fall back on?
My thought is to find a good agent who can give you the name of an attorney, fast. You will need an attorney since you have already signed with an agent. The problem is a new agent is very hesitant to interrupt once you have a contract with existing agent.
I googled this site just now which rates realtors based on criteria. There are probably better ones out there. You can try starting there. http://www.homethinking.com
You can also try the yellow pages or google search for a real estate attorney, and just shoot from the hip. Attorneys tend to be busy and slow to respond, so be prepared to go to their office in person to get anything done quickly.
Good Luck! I don't have to remind you time is short.
Everyone thinks that that nice guy/gal that works for the developer will work in my best interest to get me a good deal so that I will purchase this. Yes look at that nice smile and the way they act like they have know you all their life. You have a sales person here - did you notice the statement "works for the developer"
These sales people may not even have a Real Estate Lic. They only answer to their boss and pocket book. They have bonuses and spiffs for the higer the dollar amount they sell this property for.
Now true some of the price difference could be in location and features of the Condo. Also did you receive some buyer concessions that the other folks did not. Does 40K represent 5,10,15 % or more of the purchase price.
Your knowledgeble Buyers Rep knows how much the builders in that area have built into the units for different concessions. He has money built in to pay your agent give some concessions and pay the nicesalesperson some. Now the precentage has to do with the precentage of buyers that will pay full price so the other figures will change .
As I said your question may help future buyers - very fast check your paper work for a resent clause. They are time sensitive.