August 2nd
BTW, it seems that the mayor already has a tenant lined up for their current 10-story headquarters on the other side of downtown, though, he's only saying that it'll be 400 employees. That was quick, and it's good that we're not playing a game of 'musical office space'.
One of the weekly alternative papers in the city have labeled the current headquarters the "RoboCop" building:
It's actually an historic building that was both vertically expanded and totally reconstructed.