Li Wa, I'm very surprised to hear that Upper Darby is that bad...I have scoped out several neighborhoods in and around Philadelphia and Upper Darby remains one of the cleanest and spacious (few if any row houses)   There are patches of not so great streets, but for the most part I don't see anything overly negative about it.  

Did you do one and still got bit by an unexpected sewer bill?

Good suggestionOn one of my first rehabs I had an issue relating to major unexpected deficiencies in electric and plumbing systems that were exposed in demo and not in the budget. 

I had to have the carpet replaced, get the trash out and much more ...It's surprised that there were no leaks on the first day when the water was turned on.

A few more surprises could be down the road for you.There's nothing wrong with wanting to give good tenants a safe, comfortable place to live.  

I got a great deal ultimately and I was pleasantly surprised after closing that the property had been cleared of all trash. 

The smallest items can help you document your files that this was a surprise and that you really did have the intent to hold for investment purposes.

@Mark Gallagher it's rather surprising you are not using craigslist & hire only off referrals considering that you hire guys "who probably don't have the money to buy supplies"You get what you pay for folks.

The ball is in their court.Generally speaking, I am surprised that a number of software packages even call themselves PM software.

In Portlandia is about 270ish not sure on median in rents but would not be surprised if it hit that 1500 mark...