If you only had the Series LLC, then you may end up paying the foreign filings fees involved in investing across state lines.

Have we forgotten the 2008 global financial crisis that wouldn't happen in foreign countries where properties are bought with cash and the risk of foreclosures is 0? 

You can do what Real T does and only allow foreign investors:(

You typically need to register the llc as a foreign entity in the state you want to do business in.

Foreign governments are moving their gold inventory back from the U.S. to avert seizure by the U.S.  

Can likely do a foreign national loan with no US credit score usually with 25% down. 

If 32% of all purchases are bought for cash (assuming no HML is involved), then we either have a huge influx of foreign  cash, or the inventory is so microscopically tiny that 1% or less of Americans buy almost third of existing inventory.

The suburbs of great cities will get the inflow of population and you'll see multiple generations in one household(which we see in foreign countries as is). 

Lots of foreign companies operate in the US, with shareholders not even living in the US.

Foreign nationals lose a good chuck of their payout.