I did my best to remove the mold and part of effected insulation using one local mold remediation company as per their recommendation.

I also know the type of home and insulation you have is a factor. 

What about insulation, trim, appliances, the wood floor, etc?

But I’m curious whether it be now or during a vacancy if there’s an effective way to help soundproof a little better aside from the obvious open up all the drywall and insulate? 

Insulation has to go too!

The installer did not remove the original weights from the original 100 year old windows nor did he insulate the weight shafts which is a must in Northern New Hampshire where temperatures often drop to -20.

There is nothing that exists that will completely insulate your rental property from complete liability, because the minute it is rented, you are exposing yourself to liability.

Now, if sitting on a pile of cash, that is "insulation" or PROTECTION for the various "what-if's" that can and WILL arise for persons in such OVER-leveraged positions.

In the event that one tenant goes crazy and tries to sue me, I want to have a legal separation between the entities so they are insulated from legal recourse on all of them.

The attached images show the attic's current condition.The room in the back is insulated and and would require finished flooring, heat, & paint (62 sqft above 7 ft height).