Are property management companies allowed to have individuals (not a business entity) as a client

[Amorette Mason]

I'm trying to settle a heated argument.  Are property management companies (in the state of PA) allowed to manage properties for INDIVIDUALS?  By individuals I mean not a company, partnership or other business entity.  I mean just Jane Doe, can she be a client?  Example... Jane Doe buys a house and wants to rent it out.  She doesn't want to manage it.  She hires a property management company.  Is the property management company allowed to accept her as a client and act as a third party to her tenant, on her behalf?  If the answer is no, would she have to form a corporation or other business entity for that rental property in order for her to be accepted as a client for a property management company. 

All feedback and answers are appreciated.

Kind regards...