Doing this strategy on your own properties is much safer and a profitable alternative to the standard rental.

Your only out is to either evict them on legitimate grounds or, when their lease is up, you explain that they need to reapply to meet your basic standards to move into the unit.

So does anyone know what the standard sets of documents that I should request?

I have no idea about PA so I will give the standard answer, contact a local attorney or one that is more familiar with the laws of your state.

I gave the option for all tenants to pay $15 extra a month for use of the machines(costs about half as much as a laundromat in the area) and 3 out of 5 of my units opted to pay the fee via a lease addendum.The problem I'm running into is that the storage room is not being kept locked, and one of the tenants(for good reason) is complaining that the door is either being left unlocked or propped open.Now, I've looked into coin operated machines, and they cost about 3x what the standard machines cost, and they have HORRIBLE reviews for the low end models.

I'm assuming we're talking about a standard lease-option where she puts up a reasonable NROC.

Money is fairly cheap (by historical standards) so get it while you can. 

They're a standard Schlage electronic lock with a chip built in that allows for remote configuration.

Perhaps you can find a seller who will agree to a deal that give them their "equity" now...but leaves their mortgage in place for a 12 months or so (just until you can bring the house up to conventional lending standards.)  

Doing this strategy on your own properties is much safer and a profitable alternative to the standard rental.