Empire State Realty OP, L.P. is a self-administered and self-managed real estate investment trust. The Company owns, manages, operates, acquires and repositions office and retail properties in Manhattan and the greater New York metropolitan area, including the Empire State Building. Its segments include real estate segment and an observatory segment. The real estate segment includes all activities related to the ownership, management, operation, acquisition, repositioning and disposition of its real estate assets. The observatory segment operates the 86th and 102nd floor observatories at the Empire State Building. As of December 31, 2016, the Company's total portfolio included 10.1 million rentable square feet of office and retail space. As of December 31, 2016, the Company owned 14 office properties (including three long-term ground leasehold interests) encompassing approximately 9.4 million rentable square feet of office space.