Offer to run errands, make hardware store trips, bring capital to the table etc.

I was a RE broker doing acquasitions for a large syndicator in the 80s in San Francisco / Sacramento market.. and thats what brought down their billion dollar buziness taking reserve money from good projects to prop up losers..

The New York-based retailer, which also owns Bloomingdale's and Bluemercury, recently announced plans to close and sell 55 stores this fiscal year, up from an initial 50, due to strong deal momentum.

What you want to be on the lookout for is the Reserve Fund.

Woodford Reserve is probably my go to but so far my favorite is Jefferson's Ocean.

Pay a vagrant to collect and store the crap for 1 year and then deliver it to them wrapped up as a present.Frank

There is a ton more and of course if the owner decides not to renew, you have to move out all the stuff you put in and store it.

When doing your calculations - be sure to include principle, interest, property taxes (what your new ones will be - not what the current ones are - because after 1 year they reset to what you paid on the property), property insurance, and a maintenance reserve (we use $100/door/month on maintenance).  

Other than that, not factoring in replacement costs, big ticket item expenses, and not having any reserves are some main ones that come up. 

On top of that you will need to show cash reserves to support you can complete the project.