The Reston Task Force has received two brief papers concerning the practicability of building foundations to develop air rights over the Dulles Corridor. The bottom line from these two papers is that it is not economically reasonable to build them now and future construction over an already built Metrorail line will require 150' long spans that cost about 30% more than the 60' spans that could be constructed now.
Analysis & Recommendation for Air Rights Over the Dulles Corridor, Final Paper, February 2011
Feasibility Study--Technical Report on Air Rights Development over the Dulles Corridor, Appendices A and B
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