I definitely would not touch the 3.75% personal mortgage and hold that forever. 

It sounds like your off to the right start -- but watching some videos and doing some research -- keep doing that.

HOWEVER, I personally always prefer to own the entire property.

Prior to this we did get the occasional person thinking it was too cold, but we only get that about three times a year now with 3 pool cabins.  

Or perhaps the seller can provide you some financing.My guess is that any US-based lender would be making more of a personal loan than anything because it would likely be hard for them to put a lien against a property outside the States.Perhaps there are private lenders in that country that would be willing to lend to you as they would be more familiar with securing loans against properties there.

Regarding background checks you can use many different apps or software, I personally like Hemlane for tenant advertising and screening.

The value add will include TI's and renting out the 50% of the square feet that is vacant.The hangup is that in a TIC structure we have learned that every person must bring money into the deal to achieve an equitable split.

Either for violating the Alienation clause or non payment of tax insurance or mortgage payment.Now you friend is trying to figure out what to do. its simple he needs to stroke a check and pay the mortgage off. probably does not have enough time to refi.Now scenario 2.. your friend bought a sub 2 from some one that did the sub 2 and they are not paying your friend is now going to lose his/her house even though they have paid the person who bought it sub 2 ripped his payments and did not pay the underlying and is just a theif.which is it ???

Can you experienced investors share some insights on what factors are crucial to analyze and what red flags to watch out for?

Here's why:People who spend all day crunching are almost never viewing in person.