If the latter, that complicates things.

C Corp's double taxation rules definitely makes things complicated. 

But -- there may be structural planning opportunity there if they are C Corps.At a high level, you're creating a lot of nexus and potential filing obligations by buying each new property in a new US state.Your situation is complicated enough to warrant long-term, professional advisors.You'll need to consider not only your US income tax exposure and obligations, along with which tax elections and tax entity structuring is most favorable, but also your US estate tax exposure and your tax obligations in your resident country relating to the US situs assets and income. 

But, it could be a little complicated for a smaller building like duplex/triplex.

Once you have refined your vision a bit, then look at involving a more complicated investment pool.Go out there and make the most of every opportunity!

My partner prepared one that we're going to try to get signed today, but it's so long and complicated that I don't think the seller will sign it.

However a lot of that financing is very complicated that it does not really flow down to the BP level investors at least not 99% of them..  

Also, know that some investors do not like dealing with the complications of an FHA loan.

I am sure this money will have to be seasoned once its in the new LLC.2,3: I do not believe there are any complications here.4.

If the realtor is also the property manager the bounced check complicates things a bit for her.