It might be helpful to review some of the terms included in this document explaining transferable development rights:
https://www.smartgrowthamerica.org/app/legacy/documents/transfer-development-rights-policy-toolkit.pdf
Transferable Development Rights are commonly referred to as TDR’s. They are also referred to as Impervious Cover Rights or I.C. Credits. They are sold by the square foot and are priced accordingly.
Properties have two important characteristics that determine their value. One is “location” and the other is the “bundle of rights” to which the purchaser is entitled to exercise when the property is developed. Those rights control such things as use, height, access, set-backs, city services and views, as well as environmental restrictions involving water quality, endangered species, slopes, and impervious cover. Impervious Cover Rights heavily impact real estate value because they limit the size of the foot print of the development. The bigger foot print correlates to higher value.
Arguably the most relevant number to focus on is the cost of each square foot of impervious cover allowable on a given site. That number is the price or fair market value of the property divided by the number of allowable square feet of impervious cover on the property. This number offers a potential purchaser a benchmark from which to value the purchase of additional impervious cover.
A buyer willing to pay $300,000 for a property with the right to develop 10,000 square feet of the site would justifiably be willing to pay the same price or $30 per foot, for more impervious cover rights. An even higher price would be justified if the development of the property required using a significant portion of the property for non-income producing activity.
For example. A hotel site would have to use up impervious cover rights for offices, restrooms, utilities, stairs, elevators, ADA ramps, lobbies, parking areas, driveways, sidewalks, fire lanes and dumpsters. Areas such as these do not correlate with income. The number of rooms, on the other hand, does correlate with income. Therefore, the average income of every incremental square foot of impervious cover transferred would be more than the average income from each square foot of impervious cover before a transfer because the incremental impervious cover acquired by purchasing TDR’s would permit the construction of more rooms. That would result in a larger proportional increase in the income stream from the property from the addition of more of impervious cover to the site.
The proof is in a comparison of the projected average income per cubic foot of impervious cover before and after the transfer.