mark..even though you asked in 2008 and now it is 2014... http://www.ministorageoutlet.com/ here is a site you can use if you cant click it just copy and past it.. it tells you the estimate of what a storage unit will cost you and it lets you pick all the measurements and stuff..not as much as you would guess.. my husband thought around 100-200,000 for a unit.. it was only 12,000 for 14 units and all the measurements i did

While GRM is a type of comp, it's sort of a hybrid between an investment return measure like cap rates (since it at least considers income, though not expenses) and a strict comp measure like price per unit.

It looks like Fannie Mae is taking measures to qualify millenials with boatloads of toxic debt.  

-Total debt isn't a good measure of risk in this case because, well, its not risk adjusted.

Wealth is measured in time not dollars.  

You can institute the punitive measures which should be in your lease for that breach such as a fine, etc.

The next big thing is when you get to the point of them doing an actual bid, make sure they take notes, measurements, ask questions, and are in general paying attention.

measure the length and width of your walls that have the roof on it and find out the exact pitch of your roof then search the web for roofing calculator and plug your numbers in there.

(measured by comparing Zestimates to actual sale prices).You can find it here, also linked off the home page:http://www.zillow.com/howto/DataCoverageZestimateAccuracy.htm

Which basically amounts to a property inspector (more than likely an insurance adjustor or someone similar) that performs the site inspection, takes photos, and measures it - who then forwards it to some out of state appraiser who has never actually visited the subject and likely isn't an 'expert' in your local market.