To ensure clarity and security, I will include the following language: “The sale of this property is contingent upon the current occupant vacating within 14 days of the ratified agreement.

As part of my current situation, a nice lead generating platform is included in my MLS dues so I would like to keep that. 

I reside in Minnesota, and do not see anything that prohibits from having tenants sign an addendum but maybe some people can weigh in on this and if its a good idea to include or not?

Rental income finances everything in all of them including all the custom upgrades and upkeep done mostly by hired hands.

Net Operating Income is simply your income left over after all business expenses, not including principal, interest, or any reserves (since those aren't expenses yet). 

It's full of practical advice on how to manage an investment, and it includes summaries of your specific state laws, and it tells you exactly where to go to read the law for yourself.Devour the book.

Ie: if the lease (including m2m with proper notice) is expired, there's little to dispute.)

Common fees will include a set-up fee, a leasing fee for each turnover or a lease renewal fee, marking up maintenance, retaining late fees, and more.

All interaction with tenants (including paying rents) and paying of contractors would be taken care of by the S-corp.

We engage in variety of strategies/tactics, including wholesaling, flipping and rentals (long/short-term) for acquisition of  single and multi-family properties, and small apartment units (5 -50 doors).