NYT: Casement Windows See Improved Performance and Increased Use By Architects

FOR a long time, mullioned steel casement windows, the gridded kind that swing out like a door, had fallen out of fashion. They leaked badly, and a stiff wind could blow out their panes or knock their hinges askew. Over the years they have been replaced in many buildings by single-pane aluminum casement or double-hung windows.

But now those classic casements are appearing on new apartment buildings with startling regularity, especially in West Chelsea and the West Village, as part of an architectural style that pays tribute to prewar buildings.