Material Event (Form 8-K)

The Allergan HQ Mortgage Loan, which constituted approximately 5.2% of the asset pool of the issuing entity as of its cut-off date, is an asset of the issuing entity and is part of a loan combination that is being serviced and administered under the pooling and servicing agreement, dated as of September 1, 2017, relating to the CSAIL 2017-CX9 Commercial Mortgage Trust, filed as Exhibit 4.1 to the registrant's Current Report on Form 8-K filed on September 29, 2017 (the "CSAIL 2017-CX9 PSA"). Pursuant to Section 3.24(a) of the CSAIL 2017-CX9 PSA, Rialto Capital Advisors, LLC, a Delaware limited liability company, was removed as special servicer of the Allergan HQ Mortgage Loan and Torchlight Loan Services, LLC ("Torchlight"), a Delaware limited liability company, was appointed as the successor special servicer of the Allergan HQ Mortgage Loan under the CSAIL 2017-CX9 PSA.

In the interest of transaction management, this Current Report on Form 8-K is being filed to record that, effective as of June 25, 2026, the Allergan HQ Mortgage Loan will be specially serviced, if necessary, pursuant to the CSAIL 2017-CX9 PSA, by Torchlight. Torchlight maintains its principal special servicing office at 90 Park Avenue, 20th Floor, New York, New York 10016 and its telephone number is 212-883-2800.