You need to pay for water, sewer, and garbage removal in NJ.

I am in Portland as well it can be a hair tricky to manage there are some rules about asking tenants to leave there are also limits on rent increases see below: https://www.portland.gov/phb/rental-services/renter-relocation-assistance#toc-when-is-a-renter-eligible-for-relocation-assistance-Have you already purchased the property?

Currently, we have boilers and radiators that we want to remove to create space in the basement for a future conversion into another dwelling unit.

If it's pier and beam with a crawlspace like many Charleston homes, it's pretty straightforward to rewire from beneath without removing the drywall. 

What's stopping you from just giving notice to all tenants, or to the new tenant specifically, that the common areas need to be cleared of all personal items and will be removed in 24-48 hours if they're not already removed? 

And lets in all the humidity that was removed during the day.I once considered adding a duct and fan to blow air from the basement to the 2nd floor in summer, and from the 2nd floor to the basement in winter.

But I also wonder, that most beachside lots are built out and a new build may also need to remove old homes before building out a new one by the beach.  

Get your buy box down, remove all war zones from consideration, I personally look for 2-4 units for fixed rate debt.

He explain that to remove the dust, I could clean the areas very well.

If the other tenant feels it is intrusive, then make the tenant remove it or adjust it until everyone is happy.