The term "Big 5" in real estate most commonly refers to the dominant global commercial real estate services and brokerage firms that dictate a massive share of international property transactions, leasing, and advisory work. This elite group typically includes CBRE Group, Jones Lang LaSalle, Cushman & Wakefield, Colliers International, and Newmark Group. These multinational corporations provide comprehensive services encompassing corporate facility management, investment sales, property appraisal, and strategic consulting for institutional landlords and Fortune 500 tenants worldwide. Alternatively, the phrase can sometimes be used regionally to describe the top five residential real estate brokerages or major property development conglomerates operating within a specific national market.