Hello @Account Closed,
I am a landlord in Philadelphia. You will first need to obtain a business privilege license and tax id number from the City of Philadelphia before you can apply for your rental license. Once completed, there are a number of documents you must provide to your tenants, including a lead certification if any children under the age of 6 reside in the property. Go to the City of Philadelphia website that provides information for landlord/tenants, it is all spelled out there.
Now, if you have been collecting rent without these licenses and providing tenants with the required information you have an illegal rental. Therefore, you are not entitled and should not be collecting rent. If you had to evict a tenant for nonpayment the court would not only throw out your case, they would require you to give the tenants back the money you collected. Your tenants could ask/sue for the rent they paid you if this came to light and I am positive they would win.
I strongly suggest you educate yourself about the rental and business laws. Get yourself to Philly as soon as possible and get this sorted out. Oh yeah, fired your property manager. I suspect whomever you hired is not a real property manager...just someone who is collecting rent on your behalf, which is legal under certain circumstances in Philly. A property manager would have known all this and would have helped you obtain the things you needed to operate legally in the City.