We cannot understand the complex reality of site density by studying zoning maps alone. Often times the FAR of a development is higher than what is allowable in zoning regulations. This is because it is possible to negotiate for "air rights" or the sale of "transferable development rights" from one location to another.
Bonuses of additional FAR are usually paid for by a developer by providing additional public services or public access.
Click on the raised
dots in the zoning map of downtown Boston for a view of the density at
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