Cliff Stevenson is a Calgary Realtor who is redefining service in Real Estate. Cliff Stevenson is a Calgary, Canada Realtor who is redefining service in real estate. He is an Accredited Green Agent (AGA) - National Association of Green Agents And Brokers, Accredited Buyer Representative (ABR) - Real Estate Buyers Agent Council **Less than 1% of Calgary Realtors hold this designation and a Certified Condominium Specialist (CCS) - Calgary Real Estate Board.