I am renovating a walk out single family home to have a separate legal unit in the walk-out basement. 

The property manager has a legal responsibility to protect your interests.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

I will require the contractor warranty the work for 1 year, and provide the same documentation that they would provide to a paying customer.

Maybe sign your own lease (from Wisconsin Legal Blank, store in Milwaukee or order online) but keep it MTM.Also, a little brokerage 101: when you ask for something in an offer, always make sure it is specific, with a deadline and includes consequences.

Rent minus actually spent and legally deductible expenses.Step 2.

This is great information on how to use short-term rentals to offset active income like W-2 and business income at tax time and how you qualify for doing that by documenting your material participation in managing and setting up the property.

If they are legal to live and/or work in the US they will have the proper paperwork and be issued the proper numbers to track them and run checks.

She was determined to close the sale by the end of the month, but her husband, who had no legal claim to the property, refused to leave.The situation was emotionally and logistically complex.

I'd imagine having a roommate who also gains equity would turn into a legal nightmare when either of us decide to move.