Metron and Southern Water Management are two that we've been talking to.

You'll need a contact who lives in Philadelphia for a rental license now to put down their contact info for the city.

You said public water was available...would the lots require a septic system to be installed or is public sewer available? 

Complaints are always dicey when you live or have property in a jurisdiction they scan your license plate and have visibility into your property that may negatively impact you in the future.  

I post my rental listings on FurnishedFinder and Facebook (there's a couple DU living fb groups) and have had a good experience with hardly any vacancies. 

Quote from @Kyle Barnhart: I live near Phoenix and looking to invest locally.

And you probably need money for living expenses.

Buyers don't look for financing and its foreign so they don't jump on a forsale listing on zillow.I've had the best (only) luck with zillow rental adds,   starting with the pitch;  rent to own, live in a great home while you pay off owning it. 

That way, her limited funds can go toward her own living expenses. 

Where do you suppose the water will go?