For purposes of the Commercial Real Estate Broker Lien Act:

(1) Commercial real estate means any real estate other than real estate containing no more than four residential units or real estate on which no buildings or structures are located and that is zoned for single-family residential use. Commercial real estate does not include single-family residential units 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 a part of a larger building or parcel of real estate containing more than four residential units;

(2) Commission means any and all compensation that may be due a commercial real estate broker for performance of licensed services; and

(3) Commission agreement means a written agreement with a designated commercial real estate broker as required by subsections (2) through (6) of section 76-2422.