You can do windows on a lot line. The trick is to move the lot line - you need to purchase the air rights from the adjacent property owner. So your buildable lot, instead of going "ad coelum" in a vertical column up to space, would actually jog over to the left at +50' up in the air or so.
If you buy 3' width of air rights, you can do 15% windows. If you buy 20' or more, you can do all-glass. There are intermediate steps as well.
Of course, this requires the permission of the neighbor. If the neighboring building is a condo, the residents will usually be too blinded by rage to vote in favor of the deal. Even though it's basically free money for the condo association, it often means the loss of views or the perceived loss of property value. But if the neighboring building is a rental, or a commercial/office building with no plans to build taller, then you can sometimes do an air rights deal.
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la forme d'une ville change plus vite, hélas! que le coeur d'un mortel...
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