If Spire & Drenner are really "good guys" they claim, and not the greedy birds we suspect, they can design & build a park and save trees without a PUD. More simply put: They don't have to have a PUD to do the right thing for the locals.
This is about the future value of this property folks. PUDS give unlimited height & density possibilities to the property FOREVER.
Don't fall for the "locals are just anti growth crap". It's just their only defense.