The information you need should be available on line, All state/city landlord tenant regulations and codes should be readily available with a simple search.You need to know all the codes governing your business so you may as well start studying now.

Dover seems to be a good opportunity with colleges, Delaware government offices and an Air Force base. 

Mobiles in a community are subject to lot lease rates and community rules that you are responsible for similar to a condo except governed by the community owner.

Zillow and other sites will have some too of varying quality.Municipal governments may have properties tagged as rentals or owner-occupied if they conduct regular inspections, but that is inconsistent in Pennsylvania.  

For example here in San Antonio we have a strong government backing with all the different military bases and also lets not forget about the greatest championship team in the world, The San Antonio spurs lol.

There is a low income government housing neighborhood 1/2 mile from there.

My reading of the rules and regulations led me to believe that the government is trying to force ground rents out of the picture. 

It also has some government tax liens ( IRS ) in subordinate position with no equity.

Has anyone dealt with government subsidized housing?

It's powered by a huge business sector and builders are in a mad rush to build, especially with the development of the Great Park.