Home ownership fell to about 66% in 2011 - this 2.1% fall in home ownership caused the real estate crisis and crashed the economy.

Fundamentally, it is a simple four step process: 1) Identify the problem. 2) Determine the root cause of the problem.

This report will provide you with the potential cause of the fire.Since you mentioned it may be arson you may want to consider filing a police report. 

Conversions of *any* residence into a short term rental indiscriminately depletes the housing stock, causing the rest of the demand side of the market to squeeze into a smaller supply.3) More households - Along the same lines as the divorce argument, I suspect that following the crisis of 2007-2008 we saw more young adults (say, in their 20's) remaining home with their parents. 

Or do I give it to a charitable cause that can perhaps help those less fortunate?

A positive test however would cause expensive remediation.

Not worth withholding the money and causing legal action. 

If he's fired ("relieved for cause") then of course he will be unable to pay rent, but that's true of any tenant. 

I want to donate to noble causes and make a difference in the world and those around me, so what better way to be able to do that than building myself up to be able to help those in need?

Habitat for Humanity Restore locations across the country take these type of donations ... it is a great cause to donate to and get a charitable tax deduction.