We are in a quiet suburb....more urban areas with higher crime rates might call for additional measures but again, don't let this deter you.Over the last three years we have averaged 8 NET move ins per month.  

Find a model that you can run the exact same test numbers through that you trust has accurate measurements of IRR. 

Highest credit score, highest income, all measurable objective facts?

Your goals should follow the SMART criteria: specific, measurable, attainable, relevant, and time-bound.

This last weekend it measured 4 1/2 in on the rain gauge and the water made its way into the kitchen. 

If they insist on moving forward, let them know that there will be penalties for signing the lease and then canceling later.The time to do radon tests or look for mice or measure the bedrooms was during the inspection period.

Regarding financing (and sight distance approval), maybe having your architect make up a small model with people and cars to help sell the project to the bank.This could be costly and of course there's no way to measure the effectiveness on their decision. 

It helps me very much in measuring our next steps.

Keep it brief and to the point with measurable requests "you need to be out of this address on this date at this time" this isn't a discussion, and if it were me I wouldn't go there in person until he's gone, he'll probably be quite angry.

That's what I suggested you consider, an ADJUSTED measure of doing REI.