Air Rights

Overview

In common-law real estate, air rights are the property interest in the space above a parcel of land — traditionally understood, via the medieval maxim cuius est solum, eius est usque ad coelum ("whoever owns the soil owns up to the heavens"), as extending upward without limit, though 20th-century aviation law capped that claim at the airspace actually usable by the owner.[1] In dense cities, zoning codes assign each parcel a maximum buildable floor area, and where an owner does not build to that maximum, the unused portion can often be sold or transferred to a neighboring site — letting a developer build higher there than the base zoning would otherwise allow. The best-known example is Tiffany & Co.'s 1979 sale of the unused air rights above its Fifth Avenue flagship store for roughly $5 million, which let the developer of the adjacent site add about 200,000 square feet and build Trump Tower to its full height.[2]

For the Georgist wiki, air rights are worth noting as a real-world demonstration that development potential tied to a specific location is separable from the physical land parcel and has an observable market price — the same underlying intuition, applied by private markets rather than public policy, that motivates instruments like land value capture and betterment levies. Air-rights markets do not, however, capture location rent for public use; the price paid flows to the private seller, not to the public that helped create the site's value.

See Also

• Land Value Capture — public mechanisms for capturing location value, of which air-rights markets are a private-market cousin
• Betterment Levy — a public charge on value uplift, contrasted with the private sale of development rights
• Site Value — the underlying concept that air rights trade a piece of
• Harrison, The Power in the Land — the source discussing the Tiffany's air-rights sale

Sources

1. "Air rights," Wikipedia — Air rights — used for the legal definition, the cuius est solum doctrine, and the aviation-era limit on unlimited vertical ownership (basic-facts source).
2. Fred Harrison, The Power in the Land (Universe Books / Shepheard-Walwyn, 1983), Ch. 19, p. 251 — cites Tiffany & Co.'s sale of air rights for roughly $5 million as an example of development rights sold separately from the underlying site; see the wiki's book summary. Corroborated independently: the sale enabled Trump Tower's developer to add roughly 200,000 square feet at the adjacent 721 Fifth Avenue site.