Related Person Transactions	12 Months Ended
Dec. 31, 2018
Related Party Transactions [Abstract]
Related Person Transactions	Related Person Transactions The following discussion includes a description of our related person transactions for the years ended December 31, 2018, 2017 and 2016. Two North Riverside Plaza Joint Venture Limited Partnership: Effective July 20, 2015, we entered into 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 made 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 storage lease with Two North Riverside Plaza Joint Venture Limited Partnership for storage space in the basement of Two North Riverside Plaza. The storage lease expires December 31, 2020; however, each party has the right to terminate on 30 days' prior written notice. During the years ended December 31, 2018, 2017 and 2016, we recognized expense of $0.8 million, $0.8 million and $0.8 million, respectively, pursuant to the 20th/21st Floor Office Lease and the related storage lease. The future minimum lease payments scheduled to be paid by us during the current terms of this lease as of December 31, 2018 are as follows: $0.9 million in 2019 and $0.9 million in 2020. As of December 31, 2018 and 2017, we did not have any amounts due to Two North Riverside Plaza Joint Venture Limited Partnership pursuant to the 20th/21st Floor Office Lease and the related storage space. Related/Corvex: On July 31, 2014, at the reconvened session of our 2014 annual meeting of shareholders, our shareholders voted to approve the reimbursement of verified expenses incurred by Related Fund Management, LLC and Corvex Management LP (Related/Corvex) in connection with their consent solicitations to remove our former Trustees and elect the new Board of Trustees and to engage in related litigation. In August 2016, we paid a final $8.2 million payment of the $33.3 million in total reimbursements to Related/Corvex.

Related Person Transactions

The following discussion includes a description of our related person transactions for the years ended December 31, 2018, 2017 and 2016.

Two North Riverside Plaza Joint Venture Limited Partnership: Effective July 20, 2015, we entered into 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 made 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 storage lease with Two North Riverside Plaza Joint Venture Limited Partnership for storage space in the basement of Two North Riverside Plaza. The storage lease expires December 31, 2020; however, each party has the right to terminate on 30 days' prior written notice. During the years ended December 31, 2018, 2017 and 2016, we recognized expense of $0.8 million, $0.8 million and $0.8 million, respectively, pursuant to the 20th/21st Floor Office Lease and the related storage lease. The future minimum lease payments scheduled to be paid by us during the current terms of this lease as of December 31, 2018 are as follows: $0.9 million in 2019 and $0.9 million in 2020. As of December 31, 2018 and 2017, we did not have any amounts due to Two North Riverside Plaza Joint Venture Limited Partnership pursuant to the 20th/21st Floor Office Lease and the related storage space.

Related/Corvex: On July 31, 2014, at the reconvened session of our 2014 annual meeting of shareholders, our shareholders voted to approve the reimbursement of verified expenses incurred by Related Fund Management, LLC and Corvex Management LP (Related/Corvex) in connection with their consent solicitations to remove our former Trustees and elect the new Board of Trustees and to engage in related litigation. In August 2016, we paid a final $8.2 million payment of the $33.3 million in total reimbursements to Related/Corvex.