[chris08876]

I think it will be mixed use but also its feasibility will depend on how much Citadel plans on allocating to this new tower. If its a HQ, they probally will have an idea of how much square footage they need and will obviously instruct the tower designers/engineers with those parameters. Your risk will be higher if say this was a tower to cater to "X" tenants where "X" tenants have to be ascertained, so it will be easier as an HQ for a company that knows what it has in mind.