If they are late more than 5 days, start the eviction process.

I know the permitting and building process is way easier with ADUs, but I would assume that it's much more difficult with single familys.I will be acting as my own general contractor (currently waiting to be issued my remodeling contractors license).

Our lender helped with the appraisal process and cash out refinance

LOLOLOLOLOLOLI was going to give you some tips or things to check for in your search but ... nope, after your thought process, I'm not going to waste the time ...Good luck!

And I did explore logging there but as you know the permit process is the toughest in all of the US of A..

And I've also had leases for renters that are in the process of building a home and are looking to rent until construction on their new home is complete. 

My biggest concern is around not understanding the process and costs for purchasing a mobile home, having it shipped and fully setup on an existing lot.

Also because the tax sale process is so messy, even if you do a quiet title action (from #3), you may not be able to get title insurance on the property for at least a year.

If you think building and flipping is going to be a piece of cake, it will not, You need to find land, and all that is associated with building, 6-month process or longer. 

Obviously, there are differences between tenant/landlord processes/practices between Toronto and NJ so I’m in the early stages of learning about those differences.