You must pay to have your house tested for those items and then if they do have them, pay to have them cleaned or disposed of properly.It sounds like you possibly purchased these properties sight unseen which can be very dangerous, especially in a market like Detroit.

I have a lot of disposable income right now (I still live like a college kid: cheaply).

Federal and state chartered banks are prohibited from owning real estate other than as collateral taken to statisfy a debt which must be disposed of or for the bank's own use, like a main and branch facilities.

I have sent notes to tenants asking them to straighten up or I would dispose of the items that were cluttering the common areas.I believe it is important to give tenants a storage area...and it is not unrealistic to ask them to help keep common areas clear.

Will you have made enough from the lease to repay your equity, pay off the loan, and carry the vacancy until you dispose of it in some way?

I know how to dispose of bank assets for maximum recovery and minimum loss.

I look for new co-ops and organic grocery stores - I'm not organic or a foodie, to me that's a good sign of people with disposable income moving in to that area.

Based on that, it takes about 10 seconds to see that everything but the "shingles/labor" seems pretty much in line with what I'd expect.Now, as for the "shingles/labor," for a 14 square roof, you're probably looking at $1600-1800 in roofing materials, $600-800 in demo/disposal, $1000-1500 to install new roof, and $1000-1500 to install the new trusses. 

Mixed use a lender likely will only go to 65% ltv or less as they are harder to manage and dispose of.

SO...this will leave me with around $1500 (+- $200) each month of disposable income to use for investing after all my bills are paid and we pay ourselves (savings/retirement).