If they do this, then have them sign off on something saying that they forfeit everything else.

Yet another reason to hate the auction companies:  I had not yet paid the deposit b/c the auction company insisted on a clause in their contract that said that if the buyer defaulted on the contract, buyer would forfeit their entire deposit as liquidated damages. 

It states that he can break the lease at any time under these conditions… 1.He forfeits all deposits2.He must pay for all costs to lease the property to a new tenant (i.e. posting fees, rental signs, etc.)3.He must pay full rent until its leased again4.He must pay ½ months rent in an early termination fee.If it comes up again I intend to offer that to him as an alternative.There are about 9 months left on the lease, not sure why he would want to lose the entire deposit to go to another location an pay a new deposit and a pet deposit.

The tenant forfeits all claims for the return of the security deposit under section 504B.178 and is relieved of any other contractual obligation for payment of rent or any other charges for the remaining term of the lease, except as provided in this section.

Who wants to deal with a default and $0 to forfeit? 

If you get a tenant in and they decide not to buy, are you still going to purchase from the owner or forfeit your option fee?  

However it states that the 2013, 2014 and 2015 taxes have been forfeited which I assume means sold. 2016 says no taxes sold.My brother is a massive degenerate and loser, his credit is already destroyed and he's filed for bankruptcy and owes over 400K to the IRS.

Based on the purchase contract, if, outside the 15 day inspection period, my lender denies me the money, I would forfeit my earnest money deposit (from how I read it).3.)

Probate is a different plan than going after tax forfeited properties.  

You may be able to have the deposit forfeited upon termination of the lease agreement.