On propertyfinder.ae (non-mobile version) in the price graphs for areas like JLT, Marina from May 2021 I see price/sqft appreciating from 12 to 14%.

Seller finance the property- ask for an up front, non-refundable down payment of $XXX (which could be used as his primary residence down payment), payments of $X over X years at X interest rate with a balloon payment in X years2.

its very easy.. tehre are 35 states that do NOT require any license to do NON owner occupied loans.. very simple  talk to local attorney have them prep your note and mortgage and your good to go.. should not cost more that 1k or so for the docs..

Just off the top of my head, I wouldn't feel super comfortable with non-US properties because properties in the US are held to HUD code (at a minimum).

Social security number is definitely not required for non-payment for eviction in NJ.

What would be the best course of action to sue them for non-payment? 

Buying properties through non traditional channels.  4.

My local cable, internet, cell and utility companies are already using it to field calls and answer questions online and phone.

It is also the seller's fault for accepting it, they full well knew this was not right.If you were to file for eviction for non-payment of rent, you'd probably win.

. $40k will not get you a non owner occupied San Diego property unless you find some unlikely alternate financing.