George Mason University has settled on three finalists to build an Amazon-inspired expansion of its Arlington campus.

The university rolled out a request for proposals for private partners on the planned “Institute of Digital Innovation” in February, detailing plans for a building with 225,000 square feet of academic space and 135,000 square feet of private office and retail. GMU hopes to settle on a winning firm by November and strike a final development agreement by March 2021.

The university will move to a new phase of negotiations with Corporate Office Properties Trust, Wexford Science & Technology and a joint venture of Edgemoor Infrastructure & Real Estate and Harrison Street Real Estate Capital. The project would bring another 460,000 square feet of academic, office, and retail uses to the Virginia Square campus.