My adoptive father has left an apartment ($1.6 million), I am G4 visa holder, what is my liability for estate tax?

My adoptive father has left an apartment ($1.6 million), I am G4 visa holder, what is my liability for estate tax?

The fact that you are not a citizen, or have a visa, doesn't affect the amount of estate tax which your father's estate would be requried to pay. Depending on whether he made sizable gifts during his lifetime, his estate (Estate tax is payable by the decedent's estate, not the heirs.) probably will not owe any estate tax. See this (http://en.wikipedia.org/wiki/Estate_tax_in_the_United_States).