UNITED STATES
 SECURITIES AND EXCHANGE COMMISSION
 WASHINGTON, D.C. 20549

 FORM 10-K/A

 (Amendment No. 1)

 (Mark One)

 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the fiscal year ended December 31, 2023
 OR

 TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

 For the transition period from to
 Commission File Number: 001-41686

 Peakstone Realty Trust

 (Exact name of Registrant as specified in its charter)

 Maryland

 46-4654479

 (State or other jurisdiction of
 incorporation or organization)

 (IRS Employer
 Identification No.)

 1520 E. Grand Ave
 El Segundo, California 90245
 (Address of principal executive offices)
 ( 310) 606-3200
 (Registrant's telephone number)

 Securities registered pursuant to Section 12(b) of the Act:

 Title of each class
 Trading Symbol(s)
 Name of each exchange on which registered

 Common shares, $0.0001 par value per share
 PKST
 New York Stock Exchange

 Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes No
 Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes No

 Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes No
 Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes No
 Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth company" in Rule 12b-2 of the Exchange Act.

 Large accelerated filer

 Accelerated filer

 Non-accelerated filer

 Smaller reporting company

 Emerging growth company

 If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.
 Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.
 Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes No
 If securities are registered pursuant to Section 12(b) of the Exchange Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.
 Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant's executive officers during the relevant recovery period pursuant to § 240.10D-1(b).
 Aggregate market value of the common shares held by non-affiliates of the Company was approximately $ 1.0 billion based on the closing sale price on the New York Stock Exchange for such shares on June 30, 2023.
 As of March 26, 2024 there were 36,342,065 common shares outstanding.
 Documents Incorporated by Reference: N one
 Auditor Name: Ernst & Young LLP Auditor Location: Los Angeles, California Auditor Firm ID: 42

 EXPLANATORY NOTE

 Peakstone Realty Trust (the "Company"), is filing this Amendment No. 1 on Form 10-K/A (the "Amendment") to our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 (the "Form 10-K"), which was filed on February 22, 2024, to provide separate audited combined financial statements for Galaxy REIT LLC, an unconsolidated joint venture in which the Company holds a 49% interest ("Office Joint Venture"), in accordance with Rule 3-09 of Regulation S-X. The combined financial statements of the Office Joint Venture as of and for the year ended December 31, 2023 were not available at the time that the Company filed its Form 10-K on February 22, 2024. The Office Joint Venture's audited Combined Financial Statements as of December 31, 2023 and 2022, for the year ended December 31, 2023 and for the period from August 26, 2022 (Commencement of Operations) to December 31, 2022, and Report of Independent Auditors, are filed as Exhibit 99.1 and are included as financial statement schedules in Item 15 of this Amendment.

 This Amendment also updates, amends and supplements Part IV, Item 15 of the Form 10-K to include the filing of Exhibit 23.2, the consent of Ernst & Young LLP, and the filing of new Exhibits 31.3 and 31.4 and the furnishing of new Exhibits 32.3 and 32.4, certifications of our Chief Executive Officer and Chief Financial Officer, pursuant to Rule 13a-14(a) and (b) of the Securities and Exchange Act of 1934.

 Except as described above, this Amendment is not intended to update or modify any other information presented in the Form 10-K for the fiscal year ended December 31, 2023, as originally filed. This Amendment does not update or modify in any way the financial position, results of operations, cash flows or related disclosures in the Form 10-K and does not reflect events occurring after the Form 10-K's original filing date of February 22, 2024. Accordingly, this Amendment should be read in conjunction with the Form 10-K for the year ended December 31, 2023 and any subsequent filings with the Securities and Exchange Commission.

 ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES
 (a) List of Documents Filed.
 1. The financial statements previously filed and listed on page F-1 of the previously filed Annual Report on Form 10-K for the year ended December 31, 2023, filed on February 22, 2024. The financial statements listed on the Exhibit Index below are included in this Amendment No. 1 to Annual Report on Form 10-K/A pursuant to Rule 3-09 of Regulation S-X.
 2. Schedule III — Real Estate and Accumulated Depreciation previously filed and set forth beginning on page S-1 of the previously filed Annual Report on Form 10-K for the year ended December 31, 2023, filed on February 22, 2024. All other schedules for which provision is made in the applicable accounting regulations of the SEC are not required under the related instructions or are not applicable and therefore have been omitted.
 3. The Exhibits filed in response to Item 601 of Regulation S-K are listed on the Exhibit Index below.
 (b) See (a) 3 above.
 (c) See (a) 2 above.

 EXHIBIT INDEX
 The following exhibits are included in this Annual Report on Form 10-K for the year ended December 31, 2023 (and are numbered in accordance with Item 601 of Regulation S-K).

 Exhibit No.
 Description

 2.1

 Agreement and Plan of Merger, dated as of October 29, 2020, by and among Griffin Capital Essential Asset REIT, Inc., GRT (Cardinal REIT Merger Sub), LLC, Griffin Capital Essential Asset Operating Partnership, L.P., GRT OP (Cardinal New GP Sub), LLC, GRT OP (Cardinal LP Merger Sub), LLC, GRT OP (Cardinal OP Merger Sub), LLC, Cole Office & Industrial REIT (CCIT II), Inc., Cole Corporate Income Operating Partnership II, LP and CRI CCIT II LLC (incorporated by reference to Annex A to the Proxy Statement/Prospectus that is part of the Registration Statement on Form S-4, filed on November 25, 2020, SEC File No. 333-250962)

 2.2

 Agreement and Plan of Merger, dated as of December 14, 2018, by and among Griffin Capital Essential Asset REIT II, Inc., Griffin Capital Essential Asset Operating Partnership II, L.P., Globe Merger Sub, LLC, Griffin Capital Essential Asset REIT, Inc. and Griffin Capital Essential Asset Operating Partnership, L.P., incorporated by reference to Exhibit 2.1 to the Registrant's Current on Form 8-K, filed on December 20, 2018, SEC File No. 000-55605

 3.1

 Declaration of Trust, incorporated by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K, filed on January 20, 2023, SEC File No. 000-55605

 3.2

 Articles of Amendment to Declaration of Trust, incorporated by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K, filed on March 10, 2023, SEC File No. 000-55605

 3.3

 Articles of Amendment to Declaration of Trust, incorporated by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K, filed on April 17, 2023, SEC File No. 001-41686

 3.4

 Second Amended and Restated Bylaws, incorporated by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K, filed on March 20, 2023, SEC File No. 000-55605

 4.1*

 Description of Securities

 10.1+*

 Peakstone Realty Trust Second Amended and Restated Employee and Trustee Long-Term Incentive Plan

 10.2

 Eighth Amended and Restated Limited Partnership Agreement of PKST OP, L.P., dated April 13, 2023, incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K, filed on April 13, 2023, SEC File No. 000-55605

 10.3

 Second Amended and Restated Credit Agreement dated April 30, 2019, incorporated by reference to Exhibit 10.3 to the Registrant's Current Report on Form 8-K, filed on May 2019, SEC File No. 000-55605

 10.4

 First Amendment to Second Amended and Restated Credit Agreement dated October 1, 2020, by and among Griffin Capital Essential Asset Operating Partnership, L.P., the lending institutions party thereto as lenders and KeyBank, National Association, as administrative agent, incorporated by reference to Exhibit 10.1 the Registrant's Quarterly Report on Form 10-Q, filed on November 9, 2020, SEC File No. 000-55605

 10.5

 Second Amendment to Second Amended and Restated Credit Agreement dated December 18, 2020, by and among Griffin Capital Essential Asset Operating Partnership, L.P., the lending institutions party thereto as lenders and KeyBank, National Association, as administrative agent, incorporated by reference to Exhibit the Registrant's Current Report on Form 8-K, filed on December 23, 2020, SEC File No. 000-55605

 10.6

 Third Amendment to Second Amendment and Restated Credit Agreement dated July 14, 2021, by and among Griffin Realty Trust, GRT OP, L.P., and the subsidiary guarantors party thereto, the lending institutions party thereto as lenders and KeyBank National Association, as administrative agent, incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K, filed on July 16, 2021, SEC File No. 000-555605

 10.7

 Fourth Amendment to Second Amended and Restated Credit Agreement dated April 28, 2022, by and among Griffin Realty Trust, GRT OP, L.P., the subsidiary guarantors party thereto, the lending institutions party thereto as lenders and KeyBank National Association as administrative agent, incorporated by reference to Exhibit 10.1 to the Registrant's Quarterly Report on Form 10-Q, filed on August 8, 2022, SEC File No. 000-555605

 10.8

 Fifth Amendment to Second Amended and Restated Credit Agreement dated September 28, 2022, by and among Griffin Realty Trust, GRT OP, L.P., the subsidiary guarantors party thereto, the lending institutions party thereto as lenders and KeyBank National Association, as administrative agent, incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K, filed on October 4, 2022, SEC File No. 000-55605

 10.9

 Sixth Amendment to Second Amended and Restated Credit Agreement dated November 30, 2022, by and among Griffin Realty Trust, GRT OP, L.P., the subsidiary guarantors party thereto, the lending institutions party thereto as lenders and KeyBank National Association, as administrative agent, incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K, filed on December 5, 2022, SEC File No. 000-55605

 10.10

 Seventh Amendment to Second Amended and Restated Credit Agreement dated November March 21, 2023, by and among Peakstone Realty Trust, PKST OP, L.P., the subsidiary guarantors party thereto, the lending institutions party thereto as lenders and KeyBank National Association, as administrative agent, incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K, filed on March 24, 2023, SEC File No. 000-55605

 10.11

 Guaranty Agreement with KeyBank dated April 30, 2019, incorporated by reference to Exhibit 10.4 to the Registrant's Current Report on Form 8-K, filed on May 1, 2019, SEC File No. 000-55605

 10.12

 2026 Term Note payable to KeyBank dated April 30, 2019, incorporated by reference to Exhibit 10.7 to the Registrant's Current Report on Form 8-K, filed on May 1, 2019, SEC File No. 000-55605

 10.13

 Second Amended and Restated Revolving Note payable to KeyBank dated April 30, 2019, incorporated by reference to Exhibit 10.8 to the Registrant's Current Report on Form 8-K, filed on May 1, 2019, SEC File No. 000-55605

 10.14

 Schedule of Omitted Documents for KeyBank Loan, incorporated by reference to Exhibit 10.10 to the Registrant's Current Report on Form 8-K, filed on May 1, 2019, SEC File No. 000-55605

 10.15

 2025 Term Note payable to KeyBank, National Association dated December 18, 2020, incorporated by reference to Exhibit 10.2 the Registrant's Current Report on Form 8-K, filed on December 23, 2020, SEC File No. 000-55605

 10.16

 Schedule of Omitted Documents for New $400M 5-Year Term Loan, incorporated by reference to Exhibit 10.3 the Registrant's Current Report on Form 8-K, filed on December 23, 2020, SEC File No. 000-55605

 10.17

 Amended and Restated Registration Rights Agreement dated August 2, 2023, by and among Peakstone Realty Trust, PKST OP, L.P., and Griffin Capital, LLC, incorporated by reference to Exhibit 10.14 to our Quarterly Report on Form 10-K, filed on November 9, 2023, SEC File No. 001-41686

 10.18+

 Amended and Restated Employment Agreement, dated March 23, 2023, by and between Peakstone Realty Trust and Michael J. Escalante, incorporated by reference to Exhibit 10.8 to the Registrant's Quarterly Report on Form 10-Q, filed May 9, 2023, SEC File No. 001-41686

 10.19+

 Amended and Restated Employment Agreement, dated March 23, 2023, by and between Peakstone Realty Trust and Javier F. Bitar, incorporated by reference to Exhibit 10.9 to the Registrant's Quarterly Report on Form 10-Q, filed May 9, 2023, SEC File No. 001-41686

 10.20+

 Amended and Restated Employment Agreement, dated March 23, 2023, by and between Peakstone Realty Trust and Nina Momtazee Sitzer, incorporated by reference to Exhibit 10.10 to the Registrant's Quarterly Report on Form 10-Q, filed May 9, 2023, SEC File No. 001-41686

 10.21+*

 Amendment No. 1 to Amended and Restated Employment Agreement, dated November 14, 2023, by and between Peakstone Realty Trust and Michael J. Escalante

 10.22+*

 Amendment No. 1 to Amended and Restated Employment Agreement, dated November 14, 2023, by and between Peakstone Realty Trust and Javier F. Bitar

 10.23+*

 Amendment No. 1 to Amended and Restated Employment Agreement, dated November 14, 2023, by and between Peakstone Realty Trust and Nina Momtazee Sitzer

 10.24+

 Form of Employment Agreement for Other Officers dated December 14, 2018, incorporated by reference to Exhibit 10.7 to our Predecessor's Current Report on Form 8-K, filed on December 20, 2018, SEC File No. 000-54377

 10.25+

 Form of One-Time Restricted Stock Unit (NEOs) dated March 25, 2021, incorporated by reference to Exhibit 10.4 to the Registrant's Quarterly Report on Form 10-Q, filed on May 7, 2021, SEC File No. 000-55605

 10.26+

 Form of One-Time Restricted Stock Unit Agreement (Employees) dated March 25, 2021, incorporated by reference to Exhibit 10.5 to the Registrant's Quarterly Report on Form 10-Q, filed on May 7, 2021, SEC File No. 000-55605

 10.27+

 Form of One-Time Restricted Stock Unit Agreement (Director) dated March 25, 2021, incorporated by reference to Exhibit 10.6 to the Registrant's Quarterly Report on Form 10-Q, filed on May 7, 2021, SEC File No. 000-55605

 10.28+*

 Form of Time-Based Restricted Stock Unit Agreement (NEOs) dated August 5, 2022

 10.29+*

 Form of Time-Based Restricted Stock Unit Agreement (Employees) dated August 5, 2022

 10.30+*

 Form of Time-Based Restricted Share Unit Agreement (NEOs) dated March 23, 2023

 10.31+*

 Form of Time-Based Restricted Stock Unit Agreement (Employees) dated March 23, 2023

 10.32+*

 Form of Restricted Share Award Agreement (Non-Employee Trustees) dated June 20, 2023

 10.33+*

 Form of Time-Based Restricted Stock Unit Agreement (NEOs) for 2024

 10.34+*

 Form of Time-Based Restricted Stock Unit Agreement (Employees) for 2024

 10.35+

 Separation and Consulting Agreement, dated as of June 22, 2023, by and among Peakstone Realty Trust, PKST OP, L.P., Griffin Capital Real Estate Company, LLC and Scott Tausk, incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K, filed on June 23, 2023, SEC File No. 001-41686

 10.36+*

 Separation Agreement, dated as of December 29, 2023, by and among Peakstone Realty Trust, PKST OP, L.P., PKST Management Company, LLC and Louis K. Sohn

 10.37

 Redemption Agreement dated April 10, 2023, by and among Peakstone Realty Trust, SH Global Private Real Estate Trust No. 13(H) and Shinhan Asset Management Co., Ltd., incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K, filed on April 11, 2023, SEC File No. 000-55605

 10.38

 Sublease executed March 25, 2022, by and between Griffin Capital Company, LLC and Griffin Realty Trust, incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed on March 31, 2022, SEC File No. 000-55605

 10.39

 Purchase and Sale Agreement dated August 26, 2022, by and between the Office Buyers and the GRT Sellers, incorporated by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K, filed on September 1, 2022, SEC File No. 000-55605

 10.40

 Joint Venture and Limited Liability Company Agreement of NVO Promote LLC, dated August 26, 2022, by and between GRT VAO OP, LLC and RVMC Capital LLC, incorporated by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K, filed on September 1, 2022, SEC File No. 000-55605

 10.41*

 Form of Indemnification Agreement

 14.1*

 Code of Business Conducts and Ethics

 21.1*

 Subsidiaries of Peakstone Realty Trust

 23.1*

 Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm

 23.2

 Consent of Ernst & Young LLP, Independent Registered Public Accounting Firm

 31.1*

 Certification of Principal Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

 31.2*

 Certification of Principal Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

 31.3

 Certification of Principal Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

 31.4

 Certification of Principal Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

 32.1*

 Certification of Principal Executive Officer, pursuant to 18 U.S.C. Section 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002

 32.2*

 Certification of Principal Financial Officer, pursuant to 18 U.S.C. Section 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002

 32.3

 Certification of Principal Executive Officer, pursuant to 18 U.S.C. Section 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002

 32.4

 Certification of Principal Financial Officer, pursuant to 18 U.S.C. Section 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002

 97.1*

 Policy for Recovery of Erroneously Awarded Compensation

 99.1

 Audited Combined Financial Statements of Galaxy REIT LLC for the year ended December 31, 2023 and the period from August 26, 2022 (Commencement of Operations) to December 31, 2022

 101*

 *

 Previously filed, or furnished, as applicable, with the Form 10-K on February 22, 2024.

 Filed herewith.

 Furnished herewith.

 +

 Management contract, compensatory plan or arrangement filed in response to Item 15(a)(3) of Form 10-K.

 SIGNATURE
 Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

 PEAKSTONE REALTY TRUST
 (Registrant)

 Date:
 March 28, 2024
 By:
 /s/ Javier F. Bitar

 Javier F. Bitar

 Chief Financial Officer and Treasurer (Principal Financial Officer)