@Stefano Vrolijk it all depends on your credit history, whether you have an SSN/ ITIN and how much you can put down.

If he owes a decent amount on the property, wouldnt the conventional route make him lose whatever interest rate he has?

Usually its because there is a lot of debt risk. when interest rates went up a year or so ago I lost over 300k in sydication projects I was a part of because I didn't understand this concept.

In 1972 the 30 year mortgage interest rate was 7%.

It also depends on all the other policies.

My umbrella policy just sent me a non-renewal because Steadily is underwritten by Fortega which is not at least B+ rated. 

If an investor has the time, knowledge, capital and experience to be an active property investor then there are a number of strategies , that, depending on the economic market can be used to accelerate wealth building.  

Starting with your wife and possibly your kids depending on age (for example, they can help clean between tenants, this starts  their education [Check with your accountant because you may be able to pay your kids and take a deduction].- - While you will do the lion share, can you take advantage of your wife's talents and availability?

Check their occupancy, nightly rate and amenities.

It can depend on the property, but owner paying the bills seems rare these days.