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Welcome to CREN The Chicago Real Estate Network was established in 1949 as a social club for Building Managers and their colleagues. Today CREN has grown into a social and charitable organization where property professionals get together several times a year to socialize and keep in touch. Welcome to CREN The Chicago Real Estate Network was established in 1949 as a social club for Building Managers and their colleagues. Today CREN has grown into a social and charitable organization where property professionals get together several times a year to socialize and keep in touch.