At the same time it's currently functioning with no sign of substantial compromise to the cast iron pipe beside the age.  

If you are finding that people are complaining about the functionality of it, then look into upgrading it.

Wholesale fee + broker fee combined.

BRRRRs would allow you to combine both your experience in flips and your interest in rental, and it's a great way to scale.

We sold 2 properties and did a 1031 exchange and used a combination of hard money and private financing to acquire the building.

Cheap and functional is all it needs to be.

This combined with determining you time horizon for when you will need the money will guide how aggressive your investing should be. 

A business or real estate attorney or estate attorney will not know enough specifics in the detail to arrange true protections of combining cost efficient LLCs and managing holding companies and trusts to shield you from liability.

The electric has been off so the sump pump would not be functioning. 

The combined burden of vacancy, repair expenses and the overall stress has prompt me to reassess my investmentMy options seem to be:1.