Towing Issues: Towed vehicle from apartment complex/parking, nfl playoff games, chester county pa

Question
My son lives in a privately owned apartment complex in Chester County, PA near a university. Residents must be registered university students to live there.  When he signed his lease, there were 4-6 parking spaces at the large complex that were designated for visitors.  He recently got written notice that visitors are no longer allowed to park in the complex's lot and the visitor parking signs were removed from those 4-6 spaces. Residents were told that any car without a resident parking pass would be towed from the lot. As far as I know, there is no sign posted in the parking lot indicating that parking is for residents only and visitors are not allowed to park there, or they will be towed. My son had a friend over to watch the NFL playoff games and to hang out afterward and when he went to go to his car at 1:30AM, it had been towed. My questions are:  1-If there is no sign posted in the parking lot that there is no visitor parking and that parking is for residents only and all others will be towed, was it legal for his car to be towed? (even though residents had been informed by mail) 2-In PA, is an apartment complex required to have a minimum number of visitor parking spots available at their complex? 3-Since at the time her lease was signed, there were visitor parking spots provided by the complex, do they have the right to revoke that benefit?  I understand a complex trying to avoid random parking in its lot, but residents who pay a lot of money to live there should be able to have a guest visit for an evening and not have them get towed.  There isn't any public or street parking in near proximity. I would appreciate any feedback.

Answer
Well I tried to search for laws in your area and did not find anything specific to that area... I did find several Cities in your County which had laws and I could not pin down "SPECIFIC LAWS"  

If you want to do a search for "YOUR CITY" towing regulations or laws, then you might find specific regulations and laws...

Now as to the property owner changing the rules it happens.  Most laws require signs to be posted at the entrances to the apartment / condo complexes... That usually does meet the requirements, they are not required to post signs for each space.. Granted signs for fire lanes and handicapped spaces are usually covered under different laws..

Guest-visitor parking issues, now that can be questionable but I bet the complex is having a problem with tenants using the guest spaces to park their extra cars... In the lease-rental agreement how many spaces does it say the tenant has?  Some contracts allow for only 1 vehicle..

Now, as to the "number of guest spaces", that might be another section of your city, county or even state law.

Most places where there is no public or street parking do have major issues with parking and it does make it rough for the people who pay for the spaces to receive what they pay for...
We all know of at least one time that each of us has "broken the law" while parking even if it is for only a minute or 2...

Todays demands on the property rights are being trampled by people who just abuse the system. Yes your supposed to be able to have guests and they should have a space to park, but I think that the property management is trying to deal with a major problem and as such did a bit of a "knee jerk" reaction...

Have you discussed this with the property owner-management to see what is really happening?  Maybe you or your son can help with solving the issue.

I hope this helps a bit, but I tried for 2 days (ok a bit each day) to find specific information for this question.