You then draw your HELOC balance as the down payment for the flip.  

Most lenders typically require a 30% downpayment.

Windows would be my next check-point (less than R1) and then wall insulation: I would not be surprised if they have no insulation inside, but you can do blow-in, which only requires a small hole.A home looses heat in two ways: heat conduction (which you can slow down with insulation) and drafts, which in old houses is usually the biggest culprit.

Just be cautious of DTI (debt-to-income) ratios when qualifying for additional loans if you’re relying on projected STR income—most lenders require at least 12 months of rental history.

We will pay off a few more loans with smaller balances, even though they are lower interest than what we are getting on new acquisitions.

Pretty much any regular bank / lender is going to require themselves to be in first position on all the properties... so I don't think a HELOC type solution is going to work across multiple properties with multiple lenders.  

The ability to manage investments requires a desire.

The lease language requires the interior of the building to heat to 70 degrees.

When you open a business account the bank is required to gather Beneficial Owner information.

The house, built in the early 1900s, was outdated and required major renovations.