@Guillaume Vidallet no matter what state you create an LLC in, all other states will require you to register any LLC that does business in their state.So, you buy a rental in Michigan and place in an LLC, you'll have to register that LLC in Michigan. 

Once you can figure out how to buy your second property, then you've started beginning to master scale.But I have a questions, you said:"Our end goal is to build wealth over the next several years and leverage that wealth to buy multifamily commercial properties!"

I would express my interest in buying the house.

You just buy as many as you can and then figure it out, there is no way to prepare, you just deal with it.

Whoever they are dealing with also dropped the ball and the buyers are full of something-everything was in writing and if they signed off removing the financing clause, they are on the hook to buy. 

Do they buy it or rent it? 

I am just South of you down in Pinellas County by the Gulf Beaches and its a great time to buy now. 

i like the family connection but you really need a strong network to buy out of state.

That fills your unit for the winter and buys you time to prepare for the next time.

And I buy the seller carry back notes for those that want to cash out.I agree with jack Bosch I saw him at a rich dad event and his stuff was very dated.Its not a complicated model you buy low sell for more..