Exhibit 99.1

SECOND QUARTER 2003

Supplemental Operating and Financial Data

This Supplemental Operating and Financial Data is not an offer to sell or solicitation to buy any securities of the Company. Any offers to sell or solicitations of the Company shall be made by means of a prospectus. The information in this Supplemental Package must be read in conjunction with, and is modified in its entirety by, the Quarterly Report on Form 10-Q (the "10-Q") filed by the Company for the same period with the Securities and Exchange Commission (the "SEC") and all of the Company's other public filings with the SEC (the "Public Filings"). In particular, the financial information contained herein is subject to and qualified by reference to the financial statements contained in the 10-Q, the footnotes thereto and the limitations set forth therein. Investors may not rely on the Supplemental Package without reference to the 10-Q and the Public Filings. Any investors' receipt of, or access to, the information contained herein is subject to this qualification.

Mack-Cali Realty Corporation
Supplemental Operating and Financial Data for the Quarter Ended June 30, 2003

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INDEX

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DISCLOSURE REGARDING FORWARD-LOOKING STATEMENTS

        Certain information discussed in this literature may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and the federal securities laws, including Section 21E of the Securities Exchange Act of 1934. The Company intends such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995 and Section 21E of the Securities Exchange Act of 1934. Such forward-looking statements relate to, without limitation, the Company's future economic performance, plans and objectives for future operations and projections of revenue and other financial items. Forward-looking statements can be identified by the use of words such as "may," "will," "should," "expect," "anticipate," "estimate," "continue" or comparable terminology. Although the Company believes that the expectations reflected in such forward-looking statements are based upon reasonable assumptions at the time made, it can give no assurance that its expectations will be achieved. Forward-looking statements are inherently subject to certain risks, trends and uncertainties, many of which the Company cannot predict with accuracy and some of which the Company might not even anticipate. Future events and actual results, financial and otherwise, may differ materially from the results discussed in the forward-looking statements. Readers are cautioned not to place undue reliance on these forward-looking statements. Among the risks, trends and uncertainties are changes in the general economic conditions, including those affecting industries in which the Company's principal tenants compete; any failure of the general economy to recover timely from the current economic downturn; the extent of any tenant bankruptcies; the Company's ability to lease or re lease space at current or anticipated rents; changes in the supply of and demand for office, office/flex and industrial/warehouse properties; changes in interest rate levels; changes in operating costs; the Company's ability to obtain adequate insurance, including coverage for terrorist acts; the availability of financing; and other risks associated with the development and acquisition of properties, including risks that the development may not be completed on schedule, that the tenants will not take occupancy or pay rent, or that development or operating costs may be greater than anticipated. For further information on factors which could impact the Company and the statements contained herein, reference should be made to the Company's filings with the Securities and Exchange Commission including Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and Annual Reports on Form 10-K. The Company assumes no obligation to update or supplement forward-looking statements that become untrue because of subsequent events.

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I. COMPANY BACKGROUND

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I. COMPANY BACKGROUND

About the Company

        Mack-Cali Realty Corporation (NYSE: CLI) is one of the largest real estate investment trusts (REITs) in the United States with a total market capitalization of $4.4 billion at June 30, 2003. Mack-Cali has been involved in all aspects of commercial real estate development, management and ownership for over 50 years and has been a publicly-traded REIT since 1994. Mack-Cali owns or has interests in 263 properties, primarily class A office and office/flex buildings, totaling approximately 28.9 million square feet, serving as home to approximately 2,100 tenants. The properties are located primarily in suburban markets of the Northeast, many with adjacent, Company-controlled developable land sites able to accommodate up to 8.9 million square feet of additional commercial space.

History

        Established over 50 years ago, in 1994 the New Jersey-based firm became a publicly-traded company listed on the New York Stock Exchange under the ticker symbol CLI. Through combinations with some of the top companies in the real estate industry—most notably New Jersey-based Mack Company and Westchester, New York-based Robert Martin Company—Mack-Cali has become one of the leading real estate companies in the country.

Strategy

        Mack-Cali's strategy is to be a significant real estate owner and operator in its core, high-barriers-to-entry markets, primarily in the Northeast.

Summary
(as of June 30, 2003)

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Board of Directors

William L. Mack, Chairman of the Board

Executive Officers

Mitchell E. Hersh, Chief Executive Officer

Timothy M. Jones, President

Barry Lefkowitz, Executive Vice President and Chief Financial Officer

Roger W. Thomas, Executive Vice President, General Counsel and Secretary

Michael A. Grossman, Executive Vice President

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Equity Research Coverage

Company Contact Information

Mack-Cali Realty Corporation
Investor Relations Department
11 Commerce Drive
Cranford, New Jersey 07016-3599
Phone: (908) 272-8000    Web: www.mack-cali.com
Fax: (908) 272-6755    E-mail: investorrelations@mack-cali.com

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II. FINANCIAL HIGHLIGHTS

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II. FINANCIAL HIGHLIGHTS

Quarterly Summary

        Funds from operations (FFO), after adjustment for straight-lining of rents, for the quarter ended June 30, 2003 amounted to $66.5 million, or $0.92 per share, versus $72.1 million, or $1.00 per share, for the quarter ended June 30, 2002. For the six months ended June 30, 2003, FFO, after adjustment for straight-lining of rents, amounted to $132.1 million, or $1.84 per share, versus $138.0 million, or $1.92 per share, for the same period last year.

        Effective with this reporting of second quarter results, in order to best report FFO in accordance with the Securities and Exchange Commission's recent guidance in respect of Regulation G concerning non-GAAP financial measures and to disclose FFO on a comparable basis with the vast majority of all other companies in the industry, Mack-Cali is revising its definition of FFO to adhere to the National Association of Real Estate Investment Trust's (NAREIT) definition of FFO by including the effect of income arising from the straight-lining of rents, as follows:

        FFO for the quarter ended June 30, 2003 amounted to $70.7 million, or $0.98 per share, versus $73.3 million, or $1.02 per share, for the quarter ended June 30, 2002. For the six months ended June 30, 2003, FFO amounted to $139.7 million, or $1.95 per share, versus $140.9 million, or $1.97 per share, for the same period last year.

        The effect of the change to FFO as compared to amounts calculated under the Company's old FFO definition is an increase of $4.2 million, or $0.06 per share, and $1.2 million, or $0.02 per share, for the quarter ended June 30, 2003 and 2002, respectively, and an increase of $7.6 million, or $0.11 per share, and $2.9 million, or $0.04 per share, respectively, for the six months ended June 30, 2003 and 2002.

        The Company is also reflecting this change retroactively to the earliest periods being reported. Accordingly, FFO per diluted share will increase as follows:

        Since, in accordance with generally accepted accounting principles (GAAP), the effect of straight-lining of rents has always been included in reported net income, this change will not have an impact on net income or earnings per share. For further discussion, see "Information About FFO" in this release.

        Net income available to common shareholders for the second quarter 2003 equaled $33.6 million, or $0.58 per share, versus $35.0 million, or $0.61 per share, for the same quarter last year, a per share decrease of 4.9 percent. For the six months ended June 30, 2003, net income available to common shareholders equaled $63.6 million, or $1.10 per share, versus $75.7 million, or $1.31 per share, for the same period last year, a decrease of 16.0 percent on a per share basis.

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        Total revenues for the second quarter 2003 increased 3.2 percent to $145.6 million as compared to $141.1 million for the same quarter last year. For the six months ended June 30, 2003, total revenues amounted to $293.9 million, an increase of 3.5 percent over total revenues of $283.9 million for the same period last year.

        All per share amounts presented above are on a diluted basis; basic earnings per share is included in the financial tables accompanying this press release.

        The Company had 58,011,329 shares of common stock, 25,000 shares of cumulative redeemable perpetual preferred stock, 7,800,497 common operating partnership units and 215,456 $1,000-face-value preferred operating partnership units outstanding as of quarter end. The outstanding preferred units are convertible into 6,218,066 common operating partnership units. Assuming conversion of all preferred units into common units, the Company had a total of 72,029,892 shares/common units outstanding at June 30, 2003.

        As of June 30, 2003, the Company had total indebtedness of approximately $1.7 billion, with a weighted average annual interest rate of 6.82 percent. Mack-Cali had a total market capitalization of $4.4 billion and a debt-to-undepreciated assets ratio of 40.3 percent at June 30, 2003. The Company had an interest coverage ratio of 3.46 times for the quarter ended June 30, 2003.

        The following is a summary of the Company's recent activity:

Property Sales

        In April, Stadium Gateway, a 273,194 square-foot class A office building in Anaheim, California, was sold for approximately $52.5 million. A joint venture of the Company and Highridge Partners held a 65 percent interest in the property.

Financing Activity

        In June, the Company issued $100 million face amount of 4.60 percent senior unsecured notes due June 15, 2013. The total proceeds from the issuance (net of selling commissions and discount) of approximately $99.1 million were used primarily to repay $62.8 million of mortgage debt at a discount of $1.7 million (recorded as a reduction in loss on early retirement of debt, net), and to reduce outstanding borrowings under the Company's revolving credit facility. The Company also recorded $1.5 million in loss on early retirement of debt, net, for the write-off of the unamortized balance of an interest rate contract in conjunction with the repayment of mortgage debt.

        Also in June, the Company repurchased $45.3 million face amount of existing 7.18 percent senior unsecured notes due December 31, 2003, for $46.7 million from Teachers Insurance and Annuity Association (TIAA). The repurchase fully retired the 7.18 percent senior unsecured notes which were due December 31, 2003. The Company recorded $1.4 million in loss on early retirement of debt, net, for costs incurred in connection with the notes repurchase.

        In June, the Company's Board of Directors declared a cash dividend of $0.63 per common share (indicating an annual rate of $2.52 per common share) for the second quarter 2003, which was paid on July 21, 2003 to shareholders of record as of July 3, 2003. The Board of Directors also declared a cash dividend of $0.6722 per depositary share, each representing 1/100^th of a share of 8 percent Series C cumulative redeemable perpetual preferred stock ($25 liquidation value per depositary share) for the period March 14, 2003 through July 14, 2003. The preferred stock dividend was paid on July 15, 2003 to shareholders of record as of July 3, 2003.

Leasing Information

        Mack-Cali's consolidated in-service portfolio was 92.2 percent leased at June 30, 2003, compared to 92.4 percent leased at March 31, 2003.

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        For the quarter ended June 30, 2003, the Company executed 170 leases totaling 973,357 square feet, consisting of 784,660 square feet of office space, 182,807 square feet of office/flex space and 5,890 square feet of industrial/warehouse space. Of these totals, 389,809 square feet were for new leases and 583,548 square feet were for lease renewals and other tenant retention transactions.

        Highlights of the quarter's leasing transactions include:

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Fremont Investment & Loan, a financial services company, signed a new lease for 25,592 square feet with a term of 10 years at 555 Taxter Road in Elmsford, New York. The 170,554 square-foot class A office property, located at Taxter Corporate Park, is 99.7 percent leased.



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McMahan Securities Co., LP, a financial services firm, signed a renewal and expansion lease for a total of 23,866 square feet at 500 West Putnam Avenue in Greenwich, Connecticut. The transaction represents an expansion of 4,446 square feet for five years and an extension of 19,420 square feet for 18 months. The 121,250 square-foot class A office building is 97.6 percent leased.



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J.B. Hanauer & Company, a fixed-income investment firm, renewed its lease of 49,000 square feet at 4 Gatehall Drive in Parsippany, New Jersey for 10 years. The 248,240 square-foot, 86.2 percent-leased class A office property is part of the Mack-Cali Business Campus.



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Bressler, Amery & Ross, P.C., a law firm, leased a total of 49,957 square feet for 10 years, consisting of a 40,031 square-foot renewal and a 9,926 square-foot expansion, at 325 Columbia Turnpike in Florham Park, New Jersey. The 168,144 square-foot class A office building is 100 percent leased.



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The Henkel Corporation, an international consumer and industrial products manufacturer, signed a five-year, 37,563 square-foot renewal and expansion lease for its North American headquarters at the Triad Building at 2200 Renaissance Boulevard in King of Prussia, Pennsylvania. The lease represents an expansion of 3,076 square feet. The Triad Building, a 174,124 square-foot class A office property, is 88.7 percent leased.



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First Tennessee Bank NA, a division of First Tennessee National Corp., signed a 10-year renewal for the entire 72,610 square-foot class A office building located at 9359 East Nichols Avenue in Englewood, Colorado.



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McKesson Information Solutions, LLC, a provider of supply management and healthcare products and services, renewed its lease for the entire 69,145 square-foot office building located at 285 Century Place in Louisville, Colorado for five years.



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Century Business Services, Inc., a corporate accounting, benefits and technology consulting firm, signed a new 10-year lease for 28,178 square feet at 8181 East Tufts Avenue in Denver, Colorado. The 185,254 square-foot, class A office building is 89.7 percent leased.

Information About FFO

        The Company considers FFO a relevant measure of REIT financial performance which the financial community desires REITs to provide. FFO is defined as net income (loss) before minority interest of unitholders (preferred and common) computed in accordance with generally accepted accounting principles ("GAAP"), excluding gains or losses from extraordinary items and sales of depreciable rental property, plus real estate-related depreciation and amortization. FFO should not be considered as an alternative for net income as an indication of the Company's performance or to cash flows as a measure of liquidity. FFO presented herein is not necessarily comparable to FFO presented by other real estate companies due to the fact that not all real estate companies use the same definition. However, the Company's FFO is comparable to the FFO of real estate companies that use the current definition of the National Association of Real Estate Investment Trusts ("NAREIT"). A reconciliation of net income to FFO is included in the financial tables on page 26.

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Key Financial Data

(a)

Includes preferred units on a converted basis into common units.

(b)

Calculated based on weighted average common shares outstanding, assuming redemption of operating partnership common units into common shares.

(c)

Calculated based on shares and units included in basic per share/unit computation, plus dilutive Common Stock Equivalents (i.e. convertible preferred units, options and warrants).

(d)

Includes preferred units on a converted basis into common units and minority interests in partially-owned properties.

(e)

Funds from Operations ("FFO") is calculated in accordance with the National Association of Real Estate Investment Trusts (NAREIT) definition, as published in October 1999.

(f)

Funds from Operations calculated after adjustment for straight-lining of rents.

(g)

Reflects square feet leased at the Company's consolidated in-service portfolio, excluding in-service development properties in lease-up.

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Same Store Results and Analysis
(dollars in thousands)

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Unconsolidated Joint Ventures Summary

Breakdown of Unconsolidated Joint Ventures

(a)

The joint venture also has a parking lot operation on adjacent land.

(b)

Property consists of a three-story theater and retail complex.

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Unconsolidated Joint Venture Financial Information

        The following is a summary of the financial position of the unconsolidated joint ventures in which the Company had investment interests as of June 30, 2003 and December 31, 2002:

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        The following is a summary of the results of operations of the unconsolidated joint ventures for the period in which the Company had investment interests during the three months ended June 30, 2003 and 2002:

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        The following is a summary of the results of operations of the unconsolidated joint ventures for the period in which the Company had investment interests during the six months ended June 30, 2003 and 2002: