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I live in an old building in a landmark district and I’ve been informed by the co-op board that we’re about to replace dozens of windows at great expense. Things happen. But when I inquired about the windows themselves, I was told they were single-pane glass windows with a really low energy rating bcs “that’s what Landmarks requires”. Is this right? Seems so nuts. We can’t even have double pane glass? Also the frames will be all-wood — again, as I was told was required by the LPC. beautiful but crazy expensive.

I’ve tried to find the rules myself, but can anyone confirm all this for me?