Find a knowledgeable and trustworthy broker in your market that can shop amongst the various providers and find you the best deal while still making sure you have the protection you need.

In the next 5 years, we can buy one property per year with 25% down (~100K), and perform the same operation of using cash-flow for paying off properties next 15 years and we will have $15K/month net-profit which hits our goal adjusted for inflation (assumed at 3%).

The experience is working out pretty well.I think their goal is to be your one-stop-shop for the whole process and that will suit me going forward. 

Background checkCredit checkPast performance.

Ensure your records include details of any hired help and the tasks they performed.

@Dennis Boettjer be careful about basing your decision solely on past deal performance.

She could have chosen a much cheaper solution, like go to a coffee shop.

BUT, please be aware of the followingMissing interest payments on a promissory note is not necessarily the result of a fraud, most often it is simply the results of a poorly performing business.  

After nearly 3 years of operating history, I'm concerned that the properties are not performing well enough to warrant continuation of the venture, and I'm considering selling.

You can also go straight to the source - Direct DSCR Lenders - don't necessarily need a mortgage broker to shop for you (especially if you are here and asking the right questions and clearly are sophisticated - unless you are SUper-strapped for time, you don't seem like an investor that needs to pay a broker for help - go straight to the lender)3) Last question- i'm seeing rates on DSCR loans in the 7.2% to 7.5% range, in addition to 1 to 2 points and they likely track 10 yr treasuries (4.26% as of today).