They are setting themselves up for failure. 1.)

Is it a money lien, judgement lien, lis pendens, mechanics lien, tax lien, or what?

The new owner if grandfathered you might not be allowed to use it as a 2 unit or if you do might be required to have serious upgrades to be allowed as a MF property.Property looks in decent shape cosmetically from the pics but I am concerned more about the mechanics and structure.

The best way to pull that off is to have a mentor with experience so you don't have to learn through your own failures.

So failure to pay would result in the rent being late, which is also grounds for eviction.HOAs can and do put rules in place to discourage rental units.  

Also, listen to the stories about failures, so you can learn from the mistakes of others.

Right now my biggest fear is that I'm expanding my business too quickly- I'm going from literally what I did all of 2014 as far as flipping for the year to doing that in the next month and its scary to acquire a ton of properties at once there is the fear of failure lots of What IF's  but I think even bigger than that fear is that I will die poor so I will do whatever it takes to be as far away from the poverty line as possible.

If we take full responsibility for our successes and FAILURES, I think that our growth will be magnified drastically...and best of all, it will happen organically.

Poor management can drive tenants out due to pricing, conditions, just normal service failures and many other things.A property for sale 2years?

On a case by case basis I have worked with tenants to allow them to pay off the last month rent in three installments, by adding an addendum to say the last month rent is to be paid how and when and is to be applied how and failure is consider a violation of the lease.I also have a standard addendum for early lease termination which is a penalty of two months rent, and if they do that I would take the SD and last month rent and call it even.