Who cares about lifetime interest costs, except to the extent you can easily lower them (refinance to a lower interest rate) to increase your cashflow.

With VRBO, strangely, it keeps recommending significant increases which isn't wrong.

You already mentioned Mid term, which can be a great way to increase cash flow.

Ditch the red rug, increase art and add dresser, bedside tables to bedrooms.

He abandoned trying to scale.Learning from this experience when my partner and I decided we wanted to double our net income, we realized it would take a increase of 2 1/2 time our volume and probably need to triple our deal flow.  

the key to a BRRRR, whether it's going to be an STR or LTR, is this:distress.you need to find a significantly distressed property, such that you can increase the ARV via the rehab. 

During the partnership, you can jointly manage the property, increase its value, negotiate a flexible repayment plan with the seller that allows for larger payments after the property appreciates, ensure a written agreement that clearly specifies repayment terms and timeframes and refinance, and the sellers are able to 1031 at their leisure? 

One group wants housing prices to increase, the other wants them to decrease. 

However, San Diego is an extreme case.However rents increase fast in San Diego.  

Throw in that you can dramatically increase the value of the property once you show consistent rent rolls much higher than when the space was used for LTR, and you have a big win.