My concern is with litigation mainly from tenants.  

This is normally a civil action and prosecutors won't touch it.

As soon as someone threatens litigation, I refuse to discuss any manner further.

The terms of the settlement should have included the tenant dropping his civil case immediately.

Perhaps not, but by having an informal talk with her you ought to be able to resolve the issue in a civil manner.

but for due diligence Civil engeneer and land planner and city planners are who you need.if you use a lawyer on the due diligence side or land use approvals it means your in a war

I got tired of chasing the guy so I reached out to the local attorneys in my area and one of them suggested for me to get information on civil court lawsuits so I did that and I sued the contractor. 3 months later we had our hearing and I was awarded about $600 and in the mean while I've learned a couple of lessons.1.

However I’ve heard someone offering cash to squatters to move out the property they just brought, to avoid months of litigation and processes.

This is from their website:"To obtain a real estate license in the state of Ohio: You must be honest, truthful and of good reputation.You must be at least 18 years old.You must be sponsored by an Ohio real estate broker.You must not have been convicted of a felony or crime of moral turpitude, adjudged by a court to have violated any civil rights laws regarding real estate within the past two years, or violated any rules of the Ohio Division of Real Estate.

However without a judgment saying they owe me the money the IRS would probably just say this is a civil dispute.