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Related Person Transactions	6 Months Ended
Related Person Transactions	Jun. 30, 2018
Related Party Transactions [Abstract]
Related Person Transactions	Related Person Transactions The following discussion includes a description of our related person transactions for the six months ended June 30, 2018 and 2017. Two North Riverside Plaza Joint Venture Limited Partnership: We have a lease with Two North Riverside Plaza Joint Venture Limited Partnership, an entity associated with Mr. Zell, our Chairman, to occupy office space on the twentieth and twenty-first floors of Two North Riverside Plaza in Chicago, Illinois (20th/21st Floor Office Lease). The initial term of the lease is approximately five years, with one 5-year renewal option. We completed improvements to the office space utilizing the $0.7 million tenant improvement allowance pursuant to the lease. In connection with the 20th/21st Floor Office Lease, we also have a lease with Two North Riverside Plaza Joint Venture Limited Partnership for storage space in the basement of Two North Riverside Plaza. The lease expires December 31, 2020; however, each party has the right to terminate on 30 days' prior written notice. During the three months ended June 30, 2018 and 2017, we recognized expense of $0.2 million and $0.2 million, respectively, and during the six months ended June 30, 2018 and 2017, we recognized expense of $0.4 million and $0.4 million, respectively, pursuant to the 20^th/21^st Floor Office Lease and the related storage space.