It also had a box for 1031 exchange.

On the flip side, I've had tenants leave behind HDTVs, heavy duty industrial socket sets, box springs and mattress, cajun food, beer, flame resistant clothing, and about $100 in change.Probably lost $2000 worth of my things over the years. 

I actually have an attorney who is partnered with me on my commercial property and also wants to be a partner in rental properties, so I have that box checked at least!

I'm new to real estate investing and really trying to look outside the box on this one. 

By the looks of the tax record, it's owned by three people (probably an inheritance), the taxes are paid every year so they didn't forget about it but the only address listed is a po box.

@Jason Lam don't be scared that you're doing something out of the box!

I used to allow them, but then had a crazy cat lady whose apartment smelled like a litter box.

They even insured a duplex with Fed Pacific boxes for me at a pretty decent price.

Do you leave it blank, use a PO Box, write encouraging notes? 

It's supposed to be for "moderate income" and a way to check Community Reinvestment Act boxes.