At what point did EDC decide they had sufficient space? Initially they indicated that they were going to require a move, and then they changed their mind and wanted to stay. How much time did you have between them saying initially that they were going to move, and the call back to say they were going to stay where they were?
I would expect that when a major department like that is going to make a change there's a fair amount of notice to you that they are going to require additional space, are not going to renew the lease, or whatever. How much time had evolved when you received that notice?