From the notice

The U.S. Government is seeking 62,024 - 65,289 ABOA SF of Office Space in Phoenix, AZ. The U.S. Government currently occupies office and related space in a building under a lease in Phoenix, AZ that will be expiring. The Government is considering alternative space if economically advantageous. In making this determination, the Government will consider, among other things, the availability of alternative space that potentially can satisfy the Government’s requirements, as well as costs likely to be incurred through relocating, such as physical move costs, replication of tenant improvements and telecommunication infrastructure, and non-productive agency downtime. Please see the attached pre-solicitation notice for more details.