For investment property HELOC's often the initial draw period is shortened to 5 years and the qualifying payment is shortened to 10 years.

That is the question, as refinancing may not solve the conventional loan issue. also many conventional loans require a seasoning period of 3-6 months.

Biggerpockets doesn't really allow you to search efficiently for them either. 

The property management software makes it extremely easy and efficient.

Some landlords offered more expensive rent for a 9 month period but the math didn't really make sense (half month savings at most) compared to a standard 12 month lease. 

At 0 completed rehabs in the last 3-years you'd be looking at 75% of the purchase price + 100% of rehab with no prepayment penalty periods.

It might depend on if owner died prior to the redemption period was over and possibly if prior to your quite title action  

Helocs (as opposed to heloans) are interest-only for a period of time, usually 10 years, so during that time the monthly payment is lower on a DTI calculation than a first position mortgage with the same balance.  

Is this a building you see yourself owning for an extended period of time and/or if you were to sell the building will there be a satisfactory return on the heavy lift capex  investment that's necessary?

Period!