Though New Canaan this summer qualified for four years of relief from a state law that allows developers to skirt local planning decisions by designating a certain percentage of units in new projects as “affordable”—and could be positioned to achieve a second four-year “moratorium” under that law—it’s unclear now whether or how the town will be able to continue doing so. The major difficulty, according to the chairman of the New Canaan Housing Authority, is the high cost and scarcity of land in town that could take a fair-sized (say, 20-unit) affordable development. “Land of any sort of sizeable acreage that is on sewer and water, is certainly subject to an [affordable housing] ‘cramdown’ from a developer, and it’s also therefore valuable to them,” Scott Hobbs told members of the Planning & Zoning Commission during their regular meeting, held Aug. 29 at Town Hall. “And knowing that someday we will run out of moratorium time, so the odds that we could buy a piece of property like that, is going to be hard.