As for Force Majeure, first this is not legal advice because I am NOT an attorney.

What legal steps need to be taken, and what to do if a tenant does not want to switch?

In other words, if a defendant can sort of figure out why they are being sued, from reading the complaint, that is enough. 

Thanks everyone.Any partnership needs to be clearly spelled out in a legal contract.

The deed of sale is to be signed at the end of the year as the seller won't be able to sell it legally beforehand as it bought it at a judicial auction and the judge order will come in November.The price agreed is €450K, that is less than €3K/sq. meter.

In the event that one tenant goes crazy and tries to sue me, I want to have a legal separation between the entities so they are insulated from legal recourse on all of them.

I find that converting the property into a duplex is a lengthy and costly process, and I want to start renting it legally without going through a long process, because I've spent for rehabs and don't want to put in more for now.

If I am literally legal bound in fealty to my seller, well, what do you expect, I'm going for blood, ALL the blood, every last drop of it....

Is it legal for me to show the property to the prospective tenants as long as I don't collect commission or sign any paperwork. 

Prices of legal Airbnb buildings here have skyrocketed.