Got flats? Developers embrace Brit slang

To most New Yorkers, “flat” is an adjective. But some marketers and developers have started using the word as a noun, as in the British slang for “apartment.” The 20-unit Aria in East Williamsburg, for one, promises European-style flats amid its 15 different layouts, according to marketers the Developers Group. And, in Manhattan, at least two new projects are putting “flats” in their names. Just off Fifth Avenue, Union Square Flats, marketed by Prudential Douglas Elliman, will be paired with a sister project, Union Square Lofts; and Infinity Flats, also a Douglas Elliman-marketed project, will have eight full-floor units — or flats — on East 21st Street.