MLB Trade Rumors:
Seriously, go offer him a fair 3-4 year deal. If he takes it, that's one less roster spot they have to worry about for the next three years. And he's unlikely to ever turn into a guy who they're unable to trade if they decide to go in a different direction a year or two down the road.
Do we know that the Cubs Haven't offered him a fair 3 - 4 year deal?