Sounds like a regulatory failure; an unoccupied building shouldn't be able to retain book value.
There were subway ads touting how convenient Chase was with 3k locations in Manhattan alone.
But cities that want to retain vibrant downtowns should consider imposing some sort of vacancy tax on commercial real estate. That would give landlords an incentive to lease their space out at a lower rate rather than waiting for a more lucrative tenant to come along.