Its a good cash flow area but I just read that Intel is investing 20 Billion dollars for a chip plant near Columbus. 

With tongue planted firmly in cheek, I wish you success.

I was thinking of planting viburnum as a cheaper alternative.

Probably $10k from your paid-for properties (rent increases and operational efficiencies) and another $5000 from the newer 10 mortgaged properties each month.Hard to find that return today but you can plant a tree that will put you in a good position to see it in ten years no beyond.

Maybe include a free upgrade for re-signing...i.e. new fridge, $200 credit for flowers to plant around house, security system...whatever is important to them.

Now that GM plants are closing in Detroit.

@Michael Plante, I mean its happening here too although, there haven't been as many new housing starts where I am.

The one small exception I have is that in my lease I set the expectation that an assigned parking spot (outdoor, uncovered, unpaved) is the tenant's responsibility to maintain so they should shovel, rake, and trim plants.

Culvert, plant some trees.  

I bought 2 homes from NetWorth Realty, one in Brandon & Plant City and rehab budgets for both went thousands and thousands more on a medium sized block home.