Sellers are forced to pay for their future counter-parties representation. 

@James Walker I would start with planning and zoning, assuming you've done that part and/or feel likely you can get it approved, then I would pay for a feasibility study from a neutral 3rd party. 

I recently purchased a duplex and the garage is being rented out by another party.

Increasing the market rent for a 3 bed split level home by $700 monthly, rented in less than a week with multiple interested parties Lessons learned?

Be transparent about the risks and potential benefits for both parties.

Do you use a 3rd party for screening?

The reason you send certified mail is so that there is a third-party confirming receipt.

Best part is I don't do FHA as well, low money down conventional tends to be go to option for investing locally in NJ. 

But the very first section of the post, notes this is a Party versus party litigation about 1 lease.  

To your point about experience with renters, it has been pretty low key (children's birthday parties, women's retreats, families getting away for a weekend, etc).