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. It owned or had interests in approximately 248 properties, consisting of approximately 119 office and approximately 110 flex properties, totaling approximately 26.6 million square feet, leased to approximately 1,600 commercial tenants and approximately 19 multi-family rental properties containing approximately 5,614 residential units, plus developable land.