> I'm sure the neighbors will be happy to sell the air rights above their buildings so that plants can get that sunlight.
Or the majority of the people that live somewhere will have all "air rights" controlled by the city, and dictate how tall things can be built. "Air rights" aren't a thing unless the jurisdiction makes it a thing; you can't charge a toll for planes passing overhead.
Why would you "bargain" with someone who doesn't own anything that you want? You're talking about compromise, not bargaining, and that involves a friendly relationship; the kind normal people living in a home don't have with anonymous developers.