Housing is about supply and demand. But you have a larger problem here:
Are you buying this property direct from the seller? And are you listening to what the seller's representative is telling you? So, first things first:
1) How do you know what the current market condition is? Have you been watching the market for several years? Are you aware of the active/sold ratios in your area for condos? Or are you reading the paper and drawing your conclusions from that?
2) If you were an expert in purchasing property, you wouldn't be posting here, so here's some advice you should take: GET REPRESENTATION. It sounds to me like your being played, and they are winning.
3) There's only two units left in this development. Basically, the builder has taken the loss/profit on this building already, and the last two units are the easiest to sell. The first two are the hardest, the last two are the easiest. If he's got 50 units on the market, he's going to do deals. But two? Sadly, James, you are a little fish, and he is a big fish, and this is a big fish game. The spring is here, and he knows he can get more in the spring than he can in February, and you know what? He probably is right.
So: Get some help, make sure you're paying the right price, and get someone who can represent you!!! You don't have to listen to the listing agent who is telling you these, ahem, rather silly stories. Even if they are true, this information isn't professional or helpful to deliver to a prospective buyer, unless they want you to go away, in which case, re-read the beginning of this paragraph.
Good luck, sounds like you need some.