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): September 12, 2016

MACK-CALI REALTY CORPORATION

(Exact Name of Registrant as Specified in Charter)

Harborside 3, 210 Hudson St., Ste. 400

Jersey City, New Jersey 07311

(Address of Principal Executive Offices)(Zip Code)

(732) 590-1000

(Registrant’s telephone number, including area code)

MACK-CALI REALTY, L.P.

(Exact Name of Registrant as Specified in Charter)

Harborside 3, 210 Hudson St., Ste. 400

Jersey City, New Jersey 07311

(Address of Principal Executive Offices)(Zip Code)

(732) 590-1000

(Registrant’s telephone number, including area code)

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 (see General Instruction A.2. below):

o                 Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o                 Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o                 Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o                 Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01                                           Other Events.

On September 12, 2016, Mack-Cali Realty Corporation (the “General Partner”), the general partner of Mack-Cali Realty, L.P. (the “Operating Partnership”), announced that the Operating Partnership has commenced a tender offer (the “Tender Offer”) to purchase for cash any and all of the Operating Partnership’s outstanding 7.750% Senior Unsecured Notes due August 15, 2019.

The Tender Offer is being made exclusively pursuant to an offer to purchase dated September 12, 2016 and related letter of transmittal and notice of guaranteed delivery, which set forth the terms and conditions of the tender offer.

A copy of the General Partner’s press release announcing the Tender Offer is filed herewith as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01                                           Financial Statements and Exhibits.

(d)                                 Exhibits

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, each Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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EXHIBIT INDEX

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