Hi, Alan!
Thank you for answering.
I’m afraid that would not make sense. Construction elements can repeat often in a single building, so if we have same window we will be stuck with same UV coords for all of them. It does make sense for elements that have few windows - they are laid out differently already (to create variation just by using texture atlas with several window types). But again, when a couple of those elements is near, you can see repetition right away.