UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): December 3, 2013

DUKE REALTY CORPORATION

DUKE REALTY LIMITED PARTNERSHIP

(Exact name of registrant specified in its charter)

Duke Realty Corporation:

Duke Realty Limited Partnership:

600 East 96th Street

Suite 100

Indianapolis, IN 46240

(Address of principal executive offices, zip code)

Registrant’s telephone number, including area code: (317) 808-6000

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

As previously reported, on November 25, 2013, Duke Realty Corporation, an Indiana corporation (the “Company”), and Duke Realty Limited Partnership, an Indiana limited partnership (the “Operating Partnership”) of which the Company is the sole General Partner, entered into a Terms Agreement (including the related Underwriting Agreement, dated as of January 10, 2013, attached as Annex A thereto and made a part thereof, the “Terms Agreement”) with each of J.P. Morgan Securities LLC, RBC Capital Markets, LLC and Wells Fargo Securities, LLC, on behalf of the underwriters named therein (the “Underwriters”), pursuant to which the Underwriters agreed to purchase from the Operating Partnership $250 million aggregate principal amount of the Operating Partnership’s 3.875% Senior Notes Due 2021 (the “Notes”). The Terms Agreement was previously filed as Exhibit 1.1 to the Operating Partnership’s and the Company’s combined Current Report on Form 8-K filed on November 26, 2013. The issuance and sale of the Notes was completed on December 3, 2013. The Operating Partnership intends to use the net proceeds from the issuance and sale of the Notes, together with cash on hand, to redeem all $250 million outstanding aggregate principal amount of its 5.40% Senior Notes due August 15, 2014 at a redemption price equal to the principal amount of the notes being redeemed plus accrued interest thereon to the redemption date plus the make-whole amount.

The Notes were issued under the Indenture, dated as of July 28, 2006 (the “Indenture”), as supplemented by the Eleventh Supplemental Indenture, dated as of December 3, 2013 (the “Supplemental Indenture”), by and between the Operating Partnership and The Bank of New York Mellon Trust Company, N.A. (as successor to J.P. Morgan Trust Company, National Association), as trustee (the “Trustee”).

The Notes were registered with the Securities and Exchange Commission (the “Commission”) pursuant to the Operating Partnership’s automatic shelf registration statement on Form S-3 (File No. 333-181030-01) (as the same may be amended or supplemented, the “Registration Statement”), under the Securities Act of 1933, as amended (the “Securities Act”). The material terms of the Notes are described in the Operating Partnership’s final prospectus supplement, as filed with the Commission on November 26, 2013 pursuant to Rule 424(b)(5) of the Securities Act, which relates to the offer and sale of the Notes and supplements the Operating Partnership’s prospectus, as filed with the Commission on April 30, 2012, contained in the Registration Statement.

A copy of the Supplemental Indenture is filed as Exhibit 4.1 to this Current Report on Form 8-K (this “Report”), and the information in the Supplemental Indenture is incorporated into this Item 1.01 by this reference. The Indenture was previously filed with the Commission on July 31, 2006 as Exhibit 4.1 to the Operating Partnership’s prior registration statement on Form S-3 (File No. 333-136173-01). The above description of the terms of the Supplemental Indenture is qualified in its entirety by reference to the Indenture and the Supplemental Indenture.

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The following exhibits are filed with this Report pursuant to Item 601 of the Commission’s Regulation S-K in lieu of filing the otherwise required exhibits to the Registration Statement. This Report is incorporated by reference into the Registration Statement, and, as such, the Company and the Operating Partnership are incorporating by reference the exhibits to this Report to cause them to be incorporated by reference into the Registration Statement as exhibits thereto. By filing this Report and the exhibits hereto, however, neither the Company nor the Operating Partnership believe that any of the information set forth herein or in the exhibits hereto represent, individually or in the aggregate, a “fundamental change” (as such term is used in Item 512(a)(1)(iii) of the Commission’s Regulation S-K) in the information set forth in, and incorporated by reference into, the Registration Statement.

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SIGNATURES

Pursuant to the requirements 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.

Date: December 3, 2013