We installed a Mr. cool DIY mini split air conditioning unit.

Someone who can cut hole in original brick exterior rear wall of fishtown town house, install necessary steel beams, and repair masonry!

Most important for both is to know risk management and proper leverage. 

You can hire an electrician to install GFCIs, and charge the tenant if they would like.I would have a plumber address the leaks as soon as possible.

I replaced my own as a new homeowner, and didn't learn until the end of installation that a breaker was included on this piece of hardware - replaced the dang thing for no reason!!!

Ceiling fan install cost me $50, and sink would be between $100-$150 to install depending in the condition of the pipes. i think Garbage Disposal would be around the same.I don't do them in units, its just another thing to maintain.

For example, maybe you can install fencing around each lot to help define lot lines and encourage tenants to grow lawns.

Has anyone ever done a deal which included a proper and complete residential fuel oil tank decommissioning having been performed by the seller personally (not a hired contractor), using cat litter, then never having the decommissioning certified/filed/inspected with the proper local authorities? 

Think about properly structuring either a Land Trust or LLC, then transfer the title into the entity. 

They may have abandoned the electrical before installing the water.