Non-US Citizen Buying RE...What Do You Need to Know??

[Christopher Erwin]

Hey BP, my friend's wife lives in the US but is not a citizen, nor has a green card. They want to purchase real estate together, AND she wants to invest in RE on her own. 

I'm aware that financing can be trickier (need more money down, etc) and in selling property the future purchaser may have to withhold a % of purchase price to ensure sale taxes are paid, etc...

Anything else they should be wary of? All tips are welcome!!