@Marcus Peterson, your accountant will have a laundry list they are comfortable with including - when did you change your drivers license, voter registration, library card, address for taxes, utilities, etc etc etc.You have to have lived in the property for 2 out of the 5 years prior to sale. 

And while most people who are killed by asbestos had daily exposure to asbestos dust, there are cases where people have contracted mesothelioma just from doing the laundry of someone who was working with it.

I just purchased a set of laundry machines for my four unit.

The mortgage is a liability; however, they are taking on more debt, so it may be a wash, unless one takes out more than they have physically put in.That is true some gifting at a discount can help.

I want to put a coin/operated laundry in the building (including a new water heater for this laundry equipment).

Dishwashers, washing machines and dryers, for example.

There are only five people in this house yet they run the washing machine EVERY day.  

. #3 A borderline legal option is for when you redo the lease, take out an amenity such as use of the laundry room or parking space, and charge separately outside of the lease agreement for that service.

I will also be covering all the costs for the property during the term, so the owner can basically wash his hands of it unless something catastrophic happens.  

I don't know what really went on in this transaction but I don't feel it is right for someone to post and air their dirty laundry on here right away..