6. EXCESS LEASE LIABILITY

On August 21, 2008, Sonus Pharmaceuticals, Inc., or Sonus, completed a transaction, or Arrangement, with OncoGenex Technologies, whereby Sonus acquired all of the outstanding preferred shares, common shares and convertible debentures of OncoGenex Technologies. Sonus then changed its name to OncoGenex Pharmaceuticals, Inc. Prior to the Arrangement, Sonus entered into a non-cancellable lease arrangement for office space located in Bothell, Washington, which was considered to be in excess of our current requirements. The liability was computed as the present value of the difference between the remaining lease payments due less the estimate of net sublease income and expenses and had been accounted for in accordance with ASC 805-20, “Business Combinations -Identifiable Assets and Liabilities, and Any Noncontrolling Interest.” In February 2015, we entered into a Lease Termination Agreement with the landlord for the office space in Bothell such that the lease terminated effective March 1, 2015. Under the Lease Termination Agreement, we paid BMR-217TH Place LLC, or BMR, a $2.0 million termination fee. We may also pay BMR an additional termination fee of $1.3 million if we (i) meet the primary endpoint for our phase 3 clinical trial for the treatment of second line metastatic CRPC with custirsen and if we (ii) close a transaction or transactions pursuant to which we receive funding in an aggregate amount of at least $20.0 million. As a result of the Lease Termination Agreement, we have recorded the lease termination fees and have made an adjustment to the lease liability to reflect the change in estimated liability.

The following represents our best estimate of the liability.