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?

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.

This was for all K-12 schools in the state, including charter schools.  

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

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

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.

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

Cost is $61k which includes a .2 acre of land.

Ideally, you'd want to be all in at 70% ARV(including repairs). 

Should we keep the rent separate or include a discount in rent as part of compensation?