Mack-Cali Realty Corporation is a self-administered and self-managed real estate investment trust (REIT). The Company owns and operates a real estate portfolio of Class A office and office/flex properties. It operates in three segments: commercial and other real estate, multi-family real estate and multi-family services. Its commercial and other real estate provides leasing, property management, acquisition, development, construction and tenant-related services for its commercial and other real estate, and multi-family real estate portfolio. Its multi-family services business also provides similar services for third parties.