An exclusive look inside Nantucket’s real-estate crisis reveals the lengths to which private developers have gone to build on the tony island—at the expense of its lower-income residentsBy Clara MolotIt’s spring on Nantucket, and kids are riding their bikes down the freshly paved streets. On either side of them, shingled houses sit close together, each with a small lot of freshly cut grass out front.A car turns the corner. “We see him coming from a mile away,” says Carlese Gumbs, a year-round resident of the island’s Beach Plum Village. “We all run inside. Nobody wants to say hi to him. Nobody wants to even look at him … even the kids,” she says. “Why would you want to speak to someone who has deceived you?”Gumbs is referring to Joshua Posner, a Nantucket summer resident and theREAD ON