New York City is doing that! There's a supertall skyscraper containing ridiculously overpriced condos going up on 57th street.It was often referred to as "the Sliver", because it tapers near its top. But now it's called "Steinway Tower", because they got permission to build it by acquiring the air rights over the old "Steinway Hall" (which is across the street from Carnegie Hall) and over another nearby building (the "Art Students' League"). NYC zoning is weird; you can stack air rights.
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