I may explain that while I’d like to buy/finance/invest in his property, I need to earn a certain return on my invested capital for the given amount of risk, and if not able to earn the return on the subject deal than I will on the next deal.  

What would be the best course of action to sue them for non-payment? 

The majority of my properties achieved infinite return via a brrrr.  

In 2019, I launched my own revenue management agency to help Airbnb owners boost their income and achieve greater returns on their short-term rental properties.

This successful flip showcased the power of strategic upgrades and partnership, resulting in a solid return on investment.

As a neighbor, personally I don't care if someone smoke a little weed every now and then, but if they are smoking non stop 25 times a day, you might lose a good tenant over that. 

I focus on total return.  

Social security number is definitely not required for non-payment for eviction in NJ.

This should include potential rental income, expenses (including property taxes, insurance, maintenance, and potential vacancy), and your expected return on investment. 

In the event your property does not sell, pivoting to a rental could be your best option and allow you to maximize return.