@Kurt Batocabe,
Just wanted to give my experience of investing in Philadelphia real estate, since Philly does have a lot of options for the buy-and-hold investor, and real estate taxes are much lower than in New Jersey. In Philly, you pay 0.14% in annual real estate tax for the assessed value of the property, which you can look up at property.phila.gov. In 2014, the city did a complete re-valuation of all of its property so the assessed values are now more closely aligned with the true market value. Typically you can expect to spend approximately 1 month of gross rent on real estate taxes, as compared to NJ where it is often 2-3x as much.
I also wanted to clarify some of the things that @Jim Kennedy said regarding the tax structure of Pennsylvania and Philadelphia. I certainly respect his advice and personal experience, but just wanted to weigh in with my own opinions based on my experiences. You should verify all of this information with your own CPA before making any decisions, however.
"If you have rental properties and Philadelphia, first you pay Pennsylvania income tax on the income."
While you do have to file a state tax return for any states where you own rental properties, you are not taxed twice on the income. You either pay the state tax in PA or in NJ. Until very recently, PA & NJ had a reciprocal arrangement anyway so there was no impact from the different states income tax rates.
"Then you pay Philadelphia business income receipts tax on the net income. Then you pay Pennsylvania income tax on the gross receipts from the rental. Then you pay Philadelphia net profits tax on the net income..."
Philadelphia's BIRT & NPT are easily filed online, and are both relatively de minimus taxes, especially given the high CAP rates available in Philadelphia compared to NJ, and the comparitively low real estate taxes. I'm not sure which tax the 'PA income tax on gross receipts' refers to, since Pennsylvania state tax is already discussed above and is based on net income, and Philadelphia wage tax applies only to W-2 income.
"Plus I hear many horror stories from my Philadelphia investor clients about issues with Philadelphia Department of licensing and inspections."
L&I is somewhat backed up currently for filings of new construction or major alteration permits, you may have to wait a couple extra weeks than usual for those or pay to have them expedited. But in terms of filing for EZ permits, commercial activity license, or rental license, the city has actually made a lot of improvements over the last year and streamlined their processes, and I haven't experienced any delays or horor stories.
"Plus, I noticed that you lived in New Jersey so add five dollars to your expenses every time be going to the city when you cross the bridge."
If a $5 charge is determining your investment strategy, you might want to re-think your purchase price.
"If you pay a management company, and you go into Philadelphia, you can expect to pay 10 or 11%..."
Management fees are an important part of your investment strategy, but your costs are going to be about the same in NJ or in PA.
Just one man's opinion, and everyone has their own strategy, so see what makes sense for your goals!