There are lenders around the country offering those products.

Right now commercial rates are more like 6% with a point. the only loans from banks I see tied to prime are vertical construction loans or horizontal construction loans.I had the same issue with I had maxed out my rental loans with lenders like Country wide and Wells fargo that reported to fico..

Why are U.S. real estate commissions more than 3x higher than in almost any other rich country?

Doss Docs are cheaper than Lightning Docs from Geraci and they can cater to junior lien positions and cross-collateralizations, too.

I used solely excel until I crosses 10/15 or so properties. 

It's a big country and if you look off the beaten path you can still make money with a STR.

Louis, but I work with investors/developers like yourself across the country.

There are often long stretches of flat SFR markets in US. like '79-'83, '89-'94, or even down markets like '06-'13 where single family home values dropped 36% on average across country, so 1% rule may help keep some investors out of trouble by at least having some cash flow to safely carry the mortgage during those times.      

Cross check your realtor's opinion with your PM's and you are off to a decent start.

One year, one of the barn cats found its way into the cellar to sleep on the warm furnace ducts (we lived in snow country).