The following words and phrases when used in this act shall have the meanings given to them in this section unless the context clearly indicates otherwise:
"Broker." A person who is licensed under the laws of this Commonwealth to act as a real estate broker.
"Commercial real estate." Any real estate other than:
The term does not include single family residential units or building lots such as condominiums, townhouses or homes in a subdivision when sold, leased or otherwise conveyed on a unit-by-unit basis even though these units may be part of a larger building or parcel of real estate containing more than four residential units.
68 P.S. § 1052