North Tower, LLC c/o Brookfield Properties

Exhibit 10.15

North Tower, LLC

c/o Brookfield Properties

000 Xxxxx Xxxxxx, 00xx Xxxxx

Xxx Xxxx, XX 00000

August 12, 2020

Via Electronic Mail

Citibank, N.A.

xxxxx.xxxxxxxx@xxxx.xxx

Attention: Xxxxx Xxxxxxxx

Re:    North Tower, LLC - 000 X. Xxxxx Xxxxxx, Xxx Xxxxxxx, Xxxxxxxxxx

Reference is hereby made to that certain loan (with a maximum committed balance of $400,000,000) issued pursuant to that certain Loan Agreement dated as of September 21, 2018 (the “Loan Agreement”), between North Tower, LLC (“Borrower”), Citibank, N.A. (“Administrative Agent”), Citigroup Global Markets Inc. and Natixis, New York Branch, collectively, as Lead Arranger, and the Financial Institutions Party listed therein, as Lenders. Capitalized terms not otherwise defined herein shall have the meanings ascribed to such terms in the Loan Agreement.

            Pursuant to Section 2.9 of the Loan Agreement, Borrower is hereby exercising its option to extend the term of the Loan from the Initial Maturity Date, set to occur October 9, 2020, to the first Extended Maturity Date occurring October 9, 2021 by giving written notice to Administrative Agent not more than ninety (90) days, but not less than thirty (30) days, prior to the Initial Maturity Date.

Please feel free to contact Xxxxx Xxxxxxxxx at Xxxxx.xxxxxxxx@xxxxxxxxxxxxxxxxxxxx.xxx or (212.417.2521) directly with any questions.

Please countersign this letter in the space provided below confirming your approval to the matters contained herein. Thank you.

Very truly yours,

North Tower, LLC

By:/s/Xxxxx Kirschner

Name: Xxxxx Xxxxxxxxx

Title: Authorized Signatory

Exhibit 10.15

Acknowledged and agreed to by:

ADMINISTRATIVE AGENT

CITIBANK, N.A.

By:___________________

Name:

Title: