As a fairly social guy when I was college age, I thought I knew a lot about the less legal aspects of party life and drugs when I had my college boarding house going putting up with roommates using alcohol.

We attract mostly guys and though we are not in the party zone, they tend to be more dirty and lots of alcohol.   

You might not be covered for something as simple as having alcohol in your system, from one drink.  

Right Rob, when my units were empty the only consumption was from the lawn.

Back in a day we used to mix denatured alcohol with borax.

That makes it more ok, I think, because you're not directly "selling" alcohol.

Whatever you seal, make sure you use the oil-based Kilz product as the alcohol-based product gas not proven as effective at odor control.Lastly, rent (or buy) an ozone generator.

What if he did drugs or was an alcoholic? 

She could sign the lease and then leave you with the alcoholic still living there if things get bad with him.Is your rent that high that you cannot attract other applications??

Keep in mind that the current incentives are subsidized, so while they may benefit the purchaser, that subsidy trickles down and gets passed back along to the masses.I strongly suggest that you research this heavily before proceeding and understand what a correct installation equates to and if the project can accommodate such... otherwise, you may only realize a portion of the system's ability.As for recouping the investment, this too should be researched... it's my understanding that the ROI takes a very long time to realize... and if I were buying a property with solar, and the price was increased because of it, I'd want to see documentation showing reduced kilowatt consumption and that usage translated into dollars.