CERTIFICATION

Re:           BANK 2017-BNK8, Commercial Mortgage Pass-Through Certificates, Series 2017-BNK8 (the “Transaction”), issued pursuant to the Pooling and Servicing Agreement dated as of November 1, 2017 (the “Pooling and Servicing Agreement”), executed in connection with the Transaction (capitalized terms used but not defined herein have the meanings set forth in the Pooling and Servicing Agreement).

                                                __________________________________________

                I, Jane Lam, certify that:

                1.             I have reviewed this report on Form 10-K and all reports on Form 10-D required to be filed in respect of the period covered by this report on Form 10-K of BANK 2017-BNK8 (the “Exchange Act periodic reports”);

                2.             Based on my knowledge, the Exchange Act periodic reports, taken as a whole, do not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

                3.             Based on my knowledge, all of the distribution, servicing and other information required to be provided under Form 10-D for the period covered by this report is included in the Exchange Act periodic reports;

                4.             Based on my knowledge and the servicer compliance statement(s) required in this report under Item 1123 of Regulation AB, and except as disclosed in the Exchange Act periodic reports, the servicer(s) have fulfilled their obligations under the servicing agreement(s) in all material respects; and

5.             All of the reports on assessment of compliance with servicing criteria for asset-backed securities and their related attestation reports on assessment of compliance with servicing criteria for asset-backed securities required to be included in this report in accordance with Item 1122 of Regulation AB and Exchange Act Rules 13a-18 and 15d-18 have been included as an exhibit to this report, except as otherwise disclosed in this report.  Any material instances of noncompliance described in such reports have been disclosed in this report on Form 10-K. 

                In giving the certifications above, I have reasonably relied on information provided to me by the following unaffiliated parties:

·Wilmington Trust, National Association, as Trustee

·Wells Fargo Bank, National Association, as Certificate Administrator

·Computershare Trust Company, National Association, as Servicing Function Participant for the Certificate Administrator (from 11/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Custodian

·Computershare Trust Company, National Association, as Servicing Function Participant for the Custodian (from 11/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Master Servicer

·National Cooperative Bank, N.A., as NCB Master Servicer

·LNR Partners, LLC, as Special Servicer (from 7/2/21 to 12/31/21)

·Midland Loan Services, a Division of PNC Bank, National Association, as Special Servicer (from 1/1/21 to 7/1/21)

·National Cooperative Bank, N.A., as NCB Special Servicer (see Exhibit 33.6)

·Park Bridge Lender Services LLC, as Operating Advisor

·CoreLogic Solutions, LLC, as Servicing Function Participant

·Wells Fargo Bank, National Association, as Master Servicer under the BANK 2017-BNK7 securitization, pursuant to which the following mortgage loans were serviced by such party: 222 Second Street (from 1/1/21 to 12/31/21)

·CoreLogic Solutions, LLC, as Servicing Function Participant under the BANK 2017-BNK7 securitization, pursuant to which the following mortgage loans were serviced by such party: 222 Second Street (from 1/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Master Servicer under the BXP 2017-CC securitization, pursuant to which the following mortgage loans were serviced by such party: Colorado Center (from 1/1/21 to 12/31/21)

·CoreLogic Solutions, LLC, as Servicing Function Participant under the BXP 2017-CC securitization, pursuant to which the following mortgage loans were serviced by such party: Colorado Center (from 1/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Master Servicer under the MSSG 2017-237P securitization, pursuant to which the following mortgage loans were serviced by such party: 237 Park Avenue (from 1/1/21 to 12/31/21)

·CoreLogic Solutions, LLC, as Servicing Function Participant under the MSSG 2017-237P securitization, pursuant to which the following mortgage loans were serviced by such party: 237 Park Avenue (from 1/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Master Servicer under the CGCMT 2017-P8 securitization, pursuant to which the following mortgage loans were serviced by such party: Pleasant Prairie Premium Outlets (from 1/1/21 to 12/31/21)

·CoreLogic Solutions, LLC, as Servicing Function Participant under the CGCMT 2017-P8 securitization, pursuant to which the following mortgage loans were serviced by such party: Pleasant Prairie Premium Outlets (from 1/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Master Servicer under the GSMS 2017-GS8 securitization, pursuant to which the following mortgage loans were serviced by such party: Cabela's Industrial Portfolio (from 1/1/21 to 12/31/21)

·CoreLogic Solutions, LLC, as Servicing Function Participant under the GSMS 2017-GS8 securitization, pursuant to which the following mortgage loans were serviced by such party: Cabela's Industrial Portfolio (from 1/1/21 to 12/31/21)

·Rialto Capital Advisors, LLC, as Special Servicer under the BANK 2017-BNK7 securitization, pursuant to which the following mortgage loans were serviced by such party: 222 Second Street (from 1/1/21 to 12/31/21)

·Aegon USA Realty Advisors, LLC, as Special Servicer under the BXP 2017-CC securitization, pursuant to which the following mortgage loans were serviced by such party: Colorado Center (from 1/1/21 to 4/20/21)

·Argentic Services Company LP, as Special Servicer under the BXP 2017-CC securitization, pursuant to which the following mortgage loans were serviced by such party: Colorado Center (from 4/21/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Special Servicer under the MSSG 2017-237P securitization, pursuant to which the following mortgage loans were serviced by such party: 237 Park Avenue (from 1/1/21 to 12/31/21)

·CoreLogic Solutions, LLC, as Servicing Function Participant under the MSSG 2017-237P securitization, pursuant to which the following mortgage loans were serviced by such party: 237 Park Avenue (from 1/1/21 to 12/31/21)

·Midland Loan Services, a Division of PNC Bank, National Association, as Special Servicer under the GSMS 2017-GS8 securitization, pursuant to which the following mortgage loans were serviced by such party: Cabela's Industrial Portfolio (from 1/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Custodian under the BANK 2017-BNK7 securitization, pursuant to which the following mortgage loans were serviced by such party: 222 Second Street (from 1/1/21 to 12/31/21)

·Computershare Trust Company, National Association, as Servicing Function Participant under the BANK 2017-BNK7 securitization, pursuant to which the following mortgage loans were serviced by such party: 222 Second Street (from 11/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Custodian under the BXP 2017-CC securitization, pursuant to which the following mortgage loans were serviced by such party: Colorado Center (from 1/1/21 to 12/31/21)

·Computershare Trust Company, National Association, as Servicing Function Participant under the BXP 2017-CC securitization, pursuant to which the following mortgage loans were serviced by such party: Colorado Center (from 11/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Custodian under the MSSG 2017-237P securitization, pursuant to which the following mortgage loans were serviced by such party: 237 Park Avenue (from 1/1/21 to 12/31/21)

·Computershare Trust Company, National Association, as Servicing Function Participant under the MSSG 2017-237P securitization, pursuant to which the following mortgage loans were serviced by such party: 237 Park Avenue (from 11/1/21 to 12/31/21)

·Wells Fargo Bank, National Association, as Custodian under the GSMS 2017-GS8 securitization, pursuant to which the following mortgage loans were serviced by such party: Cabela's Industrial Portfolio (from 1/1/21 to 12/31/21)

·Computershare Trust Company, National Association, as Servicing Function Participant under the GSMS 2017-GS8 securitization, pursuant to which the following mortgage loans were serviced by such party: Cabela's Industrial Portfolio (from 11/1/21 to 12/31/21)

Date: March 30, 2022

By /s/ Jane Lam

Name: Jane Lam

Title: President