But we moved out the low rent tenants and after the rehab we filled all units with market rent tenants.

We use Showmojo and it's been working well for 2+ years even with multifamily properties.

They should put the tenant on notice, and indicate their intent to terminate their lease if they don't correct the problem.If you have no such clause in your lease, you can find the owner of the property using tax records, then skip trace the owner and contact them to let them know of the situation.

You may run into issues trying to take a HELOC out on an investment property, and even if you can I doubt you'd want to use it for a down payment for a primary because the rates are much higher.What kind of cash flow would you be generating from your multi once you move out?

Can you elaborate on the value they add for you and how you use it?

I work out of my basement and have been trying to find a location near me that rents out individual offices. 

With many heirs and a 50-year history, you have no idea what skeletons could be hiding in the closets.

I will have POA and will conduct a 80% cash out refi, which the loan proceeds will then be paid to the seller and the title would then finally be transferred to me. 

@Bryon Andrews was spot on in his advice too - do some Zillow and FB Marketplace surfing every few weeks to see what rents in the blocks near your property have been renting for recently, and track how those fluctuate over time for a few months.  

Hi Catherine,Welcome a board to Bigger Pockets, it's a great place to learn and Network with like minded investors.