I absolutely as a landlord would take that deal as the reality is you will most likely get nothing if you do not because:-Do to our homestead protections, judgements against individuals are very very difficult to collect(being optimistic). 

It has so much potential for additional costs...Sort of devil's advocate, what's the harm in letting them go for free? 

I’m in the process of buying a piece of property that is 3.5 acres, and will develop/build it to have around 35 units. I will likely do townhome style units, but still deciding. My engineer is asking if I want to go...

There are lots of different software options that allow individual payments however, so one person doesn't have to collect the money from everyone. 

So I purchased 4 quads but they are zoned commercial instead of residential so I’m having a little tough time wondering if I should do them individually or all together on a commercial loan.

Flexibility -Hard money lenders are sometimes individuals or private lenders, which means they have more flexibility over terms and interest rates.

What would I need to propose to a new individual to bring into the deal as a guarantor during a refinance?

Set up times to meet with each one individually and lay out your expectations and sign your lease if you can't get one from the owner.

It sounds like I need to do more research into individual lenders and see which one I connect with best and would be the most responsive.

Just get rid of him and find a qualified renter to replace him.When more than one renter occupies, they are under "joint and several liability" which means each individual is 100% responsible for the terms of the lease.