There are almost 50% more listings above $1,800,000 in that zip than have sold in the last 12 months. Most of them seem to be in gated communities.
Apparently at least one unit in that project has already closed escrow (5,400sf @ $2,195,000) and another is in escrow. Chances are pretty good the buyer in the closed sale is somehow connected to the project – the first couple sales often go to insiders, as it helps establish the sale prices for appraisals of the subsequent units.