This is really not an accurate description of DSCR Loans - these are not really originated by Banks to be held on Banks' balance sheets - they are almost always going to be from Private Lenders and sold into Non-QM Securitizations (securitized into Mortgage Bonds). 

Often I will structure a participation note/mortgage. 

Credit unions often hold onto the mortgage they originate (also known as portfolio loans), whereas banks often sell the mortgages they originate on the secondary mortgage market.

You can use mortgages that doesn't require much more than credit scores and down payment such as DSCR.

I know, for a non-EU resident, I can take a Spanish Mortgage with local banks, but I was wondering if can organize and pre-approve it with Spanish bank that have branches here in the US.

There was a mortgage on the property.

I've done this to build my proper suburban home, and now I'm swapping this one for my dream home. 

Thats alright, for my first investment I'd really just like to cut my mortgage payments down so I can save money for my first true investment property. 

With a $100K, 33% down, mortgage instead of a $180K mortgage, 20% down, I manage to snag a property where the rent of 2 units covered the mortgage and taxes, and I house hacked for free.

The $700-$900 is just an estimate based on the cost of my current mortgage compared to what comparable properties in my zip code are renting for.