Call around and consult Rent-o-meter.Good luck!

Take a look here:  https://www.biggerpockets.com/perks/proYou can access them at any time by visiting BiggerPockets, hovering over your profile image and selecting "Member Perks" from the menu.If you are not a Pro member, you will be able to view but not access Pro Perks.IF you want to take advantage of the Pro Perks...because in a LOT of cases, the Pro Perk is worth MORE than a Pro membership...we have an offer for you!

You can do this on https://www.communitycrimemap.com/ -- this is the site the Stockton Police Department directly uploads their crime data to per the local government website.And mainly, you want to avoid violent crime.

When purchasing a property seller should provide buyer with City Certification (often called U&O, which is not exactly correct for Philadelphia). 

The next step would be to build the improvements - grading the site, putting in the roads, putting in the sewer, water, and electric such that houses/duplexed/industrial can be developed on the property. 

There are many good books out there on the subject, but a my personal favorite is one called “The Secret Life o Real Estate and Banking” by Phillip J Anderson.

Management almost has to have a person on site for wifi, meeting clients, etc.

The people who run the site are honest and forthright.   

There are quite a few for pay membership online sites with foreclosure information. 

Has anyone used this site for land purchases?