With the windows open at the Cobble Hill House, the sound of the Brooklyn-Queens Expressway, which the new condo building overlooks, is — delicately put — a constant roar.

But close the triple-glazed, parlor-style windows and the condo units at 78 Amity Street, at the corner of Hicks Street, transform into quiet, light-filled spacious homes with fantastic East River views, just beyond the expressway.

“Incredible, right?” said Deborah Rieders, a broker at the Corcoran Group, who is marketing the property. The firm launched sales this week for the 27-unit building, which includes one- to three-bedroom homes priced between $725,000 to $3.675 million.

Developed by Vega Management, the 5-story brick building was designed by CWB Architects and the interior designs were done by the Meshberg Group.