Is the Williamsburg townhouse market about to see a Pat Kiernan-inducedpricing bump? Actually, the neighborhood’s newest townhouse listing, at 257 Berry Street, is already way above Kiernan territory—it’s asking $3.79 million, making it, judging by a quick search, the most expensive single-family townhouse currently listed in Williamsburg. It’s new construction, according to the broker babble, and looks it. But the interior’s got some cool stuff: a sculptural steel staircase, four terraces, and a 1,150-square-foot (non-commercial) gallery with a loading dock. Maybe Kiernan should have held out for this one