Send a Lease Violation Notice immediately - by mail with proof of delivery required (cheap date through post office) and or affix the notice in a envelope with his name on it on the door of the unit. 

@Helena Goyvaerts rate for a 30-year fix would be at least 8.5% with some points (1% of loan amount).Most DSR lenders have a minimum credit score requirement from the applicant.

Most non-FHA loans will require at least 15% down but you'll have to have amazing credit.

google "all inclusive Deed of Trust" fantastic CA document we used all the way back in the early 80s If I'm not mistaken though a wrap would require the 2nd buyer to also agree to financing terms; which would be the same as me (the 1st buyer). 

Now more than ever, I am seeing offers required to be submitted through a portal where the listing agents want no business being involved with up front negotiations.

If it requires a mobile closing we use Michigan Investment Title because they willclose anywhere at no cost unless it's a ruralarea but downside is they require wires for everything which alot of title companies are starting to require anyways.

What special purpose equipment do you have for an ADU/Office that required unique wiring for it to function? 

If any of the proceeds touch the sellers hand the IRS sees it as taking profit and you will have to pay taxes on that portion.Net proceeds - Is the net sale, minus any Equity in home being sold.I find a lot of investors who want to purchase less than their reinvestment requirements will do the calculation to see what their tax burden would be if they purchase less than they sell.

Assuming you don't have a mortgage that requires a certain level of insurance, you can get a stop-loss policy covering all the properties. 

It's definitely possible to get a loan as a foreigner but the rates will be high(er) and the downpayment required will be as well.