SJP should stop seeking one large corporate tenant. Under these economic conditions, that is no longer a likely option.
Instead, he should go the other route, which is to rent to multiple tenants that may only need smaller blocks of space. That means law firms, media companies, not-for-profits, entertainment, etc.
You get enough of them and you've got a tower filled up. Not all towers need to have one, large main corporate tenant to be successful.