Business entities who are doing business in Pennsylvania need to register with the Pennsylvania Department of State, and provide a physical address within Pennsylvania for the acceptance of service of process. "Service of process" is a term for legal pleadings, such as a lawsuit (a Complaint) filed against your company. Pennsylvania allows companies to use either their own address within the State of Pennsylvania or a "c/o" or "care of" address as their registered office address on filings made with the Department of State. Out-of-State companies who do not have a physical address in Pennsylvania can designate a Commercial Registered Office Provider, or "CROP" to accept service of process on the company's behalf. Even companies that have a physical address in Pennsylvania may choose to designate a CROP for service of process for a variety of business reasons.
If using the "care of" address option on the filing, the agency named (such as Robert May & Company) must be already registered as a CROP with the Department of State. Because Robert May & Company is registered as a CROP with the Department of State, the "care of" designation only requires the name and county of the CROP, rather than an actual street address. Note that the use of a CROP is only appropriate as the registered office address on the filings made with the Department of State, it is not to be used on filings with taxing or other authorities as a street address for your entity. The address is only relevant for service of process in the event of a lawsuit. It is not an address for the receipt of mail.