Exhibit 10.21

SECOND AMENDMENT TO AGREEMENT
FOR PURCHASE AND SALE OF REAL PROPERTY

THIS SECOND AMENDMENT TO AGREEMENT FOR PURCHASE AND SALE OF REAL PROPERTY (this "Amendment") is made to be effective as of November 18, 2016, by and between ARC DB5PROP001, LLC, a Delaware limited liability company and, its sole member, AMERICAN FINANCE OPERATING PARTNERSHIP, L.P., a Delaware limited partnership (collectively "Seller"), and CAPITAL COMMERCIAL INVESTMENTS, INC., a Texas corporation ("Buyer"), (Seller and Buyer sometimes collectively referred to herein as the "Parties").

Recitals

A.The Parties entered into that certain Agreement for Purchase and Sale of Real Property (the "Original Agreement"), with an effective date of October 11, 2016, pursuant to which Buyer agreed to purchase from Seller the real property located at 1300, 1350, and 1400 American Boulevard, Hopewell Township, NJ, such real property being more particularly described therein (the "Property"). The Original Agreement was amended by First Amendment to Agreement for Purchase and Sale of Real Property dated November 10, 2016 (the "First Amendment"). The Original Agreement, as amended by the First Amendment, is hereinafter referred to as the "Agreement".

B.Seller and Buyer desire to further amend the Agreement as hereinafter set forth.

Amendment

For and in consideration of the premises and the mutual covenants and agreements hereinafter made, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the Parties hereby amend the Agreement as follows:

1.Due Diligence Period. Seller and Buyer agree the Due Diligence Period and Buyer's
right to terminate referenced in Section 6(b) of the Agreement is hereby amended to be 5:00 p.m. Central Standard Time on Wednesday, November 23, 2016. Buyer agrees as of the effective date of this Amendment, Buyer's right to terminate under Section 6(b) of the Agreement is limited to Buyer resolving its parking issues related to the Property. Except for resolution of the parking issues, Buyer acknowledges it is satisfied with the physical condition of the Property.

2.Miscellaneous.

a.    All terms and conditions of the Agreement not expressly modified by this

Amendment shall remain in full force and effect, and, in the event of any inconsistencies between this Amendment and the terms of the Agreement, the terms set forth in this Amendment shall govern and control. Except as expressly amended hereby, the Agreement shall remain in full force and effect as of the date thereof. Unless specifically defined herein or the context requires otherwise, all capitalized terms used herein shall have the meaning ascribed to them in the Agreement.

b.This Amendment may be executed in one or more counterparts which shall be construed together as one document. For purposes of the execution hereof, signatures delivered by facsimile transmission or by electronic mail (e.g. email) may be treated as originals.

c.This Amendment shall be binding upon and shall inure to the benefit of each
of the Parties and their respective successors and assigns.

EXECUTED as of the date first written above.

SELLER: ARC DB5PROP001, LLC, a Delaware limited liability company By: American Finance Operating Partnership, L.P., a Delaware limited partnership, its sole member By: American Finance Trust, Inc., a Maryland Corporation, its general partner By: /s/ Jesse C. Galloway   Name: Jesse C. Galloway   Title: Authorized Signatory BUYER: CAPITAL COMMERCIAL INVESTMENTS, INC., a Texas corporation By: /s/ Paul D. Agarwal   Name: Paul D. Agarwal   Title: President

AMERICAN FINANCE OPERATING

PARTNERSHIP, L.P., a Delaware limited

partnership

By: American Finance Trust, Inc.,

a Maryland Corporation, its general partner

By: /s/ Jesse C. GallowayName: Jesse C. GallowayTitle: Authorized Signatory