We live on Oahu but interested in investing in a condotel in Vietnam so seeing what the secret ingredients are :) 

I'll spare you all the details but the key ingredient was the two inches of sewage throughout the entire basement.

What is the easiest and simplest way to achieve this?

This is the simplest method, but it also means your tenants are more likely to abuse the utilities by leaving windows open with the heat or A/C running, leaving lights on, ignoring the toilet that constantly flushes on its own, etc.3.

Key ingredients...Highly discounted deals are what you need!

Aloha,Here is a great source for sample Commercial leases of all kinds:https://www.aircre.com/air-cre...However, since you are leasing to yourself, it may be simplest to use a local attorney to draft your document.

The key ingredient is tenant screening.

If, down the road, you want to fix it up a bit and do a cash-out refinance, you certainly can, but sometimes the simplest structure beats the most creative.

Like any marketing campaign, your ability to stick with a consistent plan and measure the results are key ingredients for success.  

The simplest, best explanation I have ever heard of why to use leverage when investing in real estate I read was right here on these forums."