This is Trolley Plaza. Grey tower under Book Tower. I've always thought of it as a very ugly tower. Even for one that's not empty and dirty.
I don't think it's ugly whatsoever. It just doesn't have the spectacular characteristics that those old ones did, back in their heyday. However I would hate to see these beautiful old depression era skyscrapers demolished. Hopefully, the empty ones can be gutted inside, reconstructed, and restored again.