The bad news is that you may not be able to completely contract out of your duty to mitigate damages; the good news is that you can limit it. But to do so, you need to add specific language to your lease. Here’s how to draft and negotiate a fair, reasonable, and legally enforceable mitigation of damages limitations clause, along with a Model Lease Clause that you can adapt for your own use. 

Include at least four costs in the guaranty cap.