There are many advantages of a Delaware LLC, there may be several disadvantages (such as annual fees, qualification, taxation, etc) depending on where you reside vs. where you do business.

@Bo Goebel I second what @Mitch Provost  and Account Closed said about the taxation of your K-1. 

3) What will be my rental Real Estate taxation rules as aforeigner?

Sarah - You made a prior post about wanting to house-hack in NJ.There are unique tax laws when it comes to house-hacking as you purchased a personal residence and an investment property.When choosing an accountant, make sure they are familiar with NJ State taxation as it is one of the more complex ones in the nation.

We don't know what business form would be ideal and how to avoid taxation becoming a nightmare.

And we fought a war with England about "taxation without representation"?

They tax at a 6% ratio as opposed to a 4% Owner/occupant..which usually figures up to three times the 4% and then a couple hundred on top of that.

Let's see, just the quick, 490 balance financed, imputed tax at 3% = $14,700 one who is selling a half million dollar home, tax rate 50% =7,350, and they received 12K, so looks like they get about $4,650 that year, assuming there was no gain on the sale.

The taxation issue(s) as a result of her non-citizenship status was because the estate did exceed the minimal amount and because of this her estate had to pay a U.S. estate tax.

How is a life insurance policy with cash value superior from a taxation standpoint when compared with a solo K?