There are both tech solutions to this where the tenant/vendor sort out their availability and you are informed on who is going where and when and there is the old fashion way where the vendor simply calls the tenant and makes arrangements. 

I've told them to sell and buy a condo but they are very old fashion.

@Bruce LynnHi Bruce, if you have friends at Facebook, Amazon, Google, PayPal, Apple and other tech firms, it might help to check in and they will tell you how each of them are lapping up office space in NYC in an unprecedented fashion.

Then take into account the global economy also interacting in a similar fashion at the national geo-political level.... 

You can't talk about rights in a singular fashion. 

Keep me posted on the brunch idea or maybe an old fashioned RE meet-up!!!

Is he going about this in the wrong fashion, and is there a way to avoid these types of sunk costs after submitting an offer?

My my goals are building wealth for retirement in a secure and high return fashion, and secondarily possibly current income with non SDIRA funds.My comments are this; 1) when people say 'dont put one tax advantaged product within another tax advantaged product' *I* think that needs to be taken on an individual basis.

I dunno.I had to deal with this stuff during the 2008 crash, and what happened back then was tenants just moved in with relatives and gave me proper notice or we worked out something in an amicable fashion - which never included them getting to stay rent-free or without owing any rent.

A Biography of George HW Bush -The Perfectionists: How Precision Engineers Created the Modern World-Spark: How Old-Fashioned Values Drive a Twenty-First-Century Corporation: Lessons from Lincoln Electric's Unique Guaranteed Employment Program-Good Profit: How Creating Value for Others Built One of the World's Most Successful Companies-The Great Mental Models, Volume 2: Physics, Chemistry and Biology-The Outsiders: Eight Unconventional CEOs and Their Radically Rational Blueprint for Success-Conspiracy: Peter Thiel, Hulk Hogan, Gawker, and the Anatomy of IntrigueWhat books have you read so far?