The Top 25 Office Owners survey includes office space owned globally as of Dec. 31, 2006. Equity Office Properties is not on this list because the company went on the selling block at the end of 2006 and was acquired by the Blackstone Group in early 2007. Several pieces of what had been EOP's approximate 108 million sq. ft. portfolio are being sold off.

  1. Brookfield Properties Corp.

    Total Office Portfolio: 76 million sq. ft.
    200 Vesey St.
    New York, NY 10281
    Phone: (212) 417-7000
    Website: www.brookfieldproperties.com
    Officers: Ric Clark, President/CEO; Bryan Davis, CFO; Dennis Friedrich, President/COO, U.S. Commercial Operations

  2. Tishman Speyer

    Total Office Portfolio: 53.9 million sq. ft.
    45 Rockefeller Plaza
    New York, NY 10111
    Phone: (212) 715-0300
    Fax: (212) 319-1745
    Email: CVitucci@tishmanspeyer.com
    Website: www.tishmanspeyer.com
    Officers: Jerry I. Speyer, President/CEO; Robert J. Speyer, Senior Managing Director/Head of New York/Chair of Management Committee; Katherine G. Farley, Senior Managing Director, Emerging Markets & Global

  3. LaSalle Investment Management

    Total Office Portfolio: 49 million sq. ft.
    200 E. Randolph Dr.
    Chicago, IL 60601
    Phone: (312) 782-5800
    Fax: (312) 228-0254
    Website: www.lasalle.com
    Officers: Jeff Jacobson, Global CEO; Jack Chandler, CEO, Asia Pacific; Peter Schaff, CEO, North America

  4. Hines

    Total Office Portfolio: 46 million sq. ft.
    2800 Post Oak Blvd.
    Houston, TX 77056
    Phone: (713) 621-8000
    Fax: (713) 966-7886
    Website: www.hines.com
    Officers: Gerald D. Hines, Chairman; Jeffrey C. Hines, President; C. Hastings Johnson, EVP/CFO

  5. TIAA-CREF

    Total Office Portfolio: 44.2 million sq. ft.
    730 Third Ave.
    New York, NY 10017
    Phone: (800) 842-2733
    Website: www.tiaa-cref.org
    Officers: Thomas Garbutt, Managing Director, Global Real Estate; Phillip McAndrews, Managing Director, Real Estate Portfolio Management; Margaret Brandwein, Managing Director, Real Estate Portfolio Management

  6. Boston Properties

    Total Office Portfolio: 43.4 million sq. ft.
    111 Huntington Ave.
    Boston, MA 02199
    Phone: (617) 236-3300
    Fax: (617) 236-3311
    Website: www.bostonproperties.com
    Officers: Mortimer Zuckerman, Chairman of the Board; Edward Linde, CEO; Douglas Linde, President

  7. HRPT Properties Trust

    Total Office Portfolio: 42 million sq. ft.
    400 Centre St.
    Newton, MA 02458
    Phone: (617) 332-3990
    Email: tbonang@hrpreit.com
    Website: www.hrpreit.com
    Officers: Adam D. Portnoy, Managing Director; John Mannix, President/COO; John Popeo, CFO

  8. Wells Real Estate Funds

    Total Office Portfolio: 39.3 million sq. ft.
    6200 The Corners Pkwy.
    Norcross, GA 30092
    Phone: (800) 448-1010
    Email: info@wellsref.com
    Website: www.wellsref.com
    Officers: Leo Wells, President; Doug Williams, SVP; Randy Fretz, Chief of Staff

  9. CB Richard Ellis Investors LLC

    Total Office Portfolio: 38.4 million sq. ft.
    515 S. Flower St., 31st Floor
    Los Angeles, CA 90071
    Phone: (213) 683-4200
    Fax: (213) 683-4301
    Website: www.cbreinvestors.com
    Officers: Vance Maddocks, CEO; William Harris, President/COO; Robert Zerbst, Chairman

  10. Mack-Cali Realty Corp.

    Total Office Portfolio: 33.9 million sq. ft.
    343 Thornall St.
    Edison, NJ 08837
    Phone: (732) 590-1000
    Fax: (732) 205-8237
    Website: www.mack-cali.com
    Officers: Mitchell E. Hersh, President/CEO; Barry Lefkowitz, EVP/CFO; Michael Grossman, EVP

  11. RREEF

    Total Office Portfolio: 33.7 million sq. ft.
    280 Park Ave., 23W
    New York, NY 10017
    Phone: (212) 454-3900
    Fax: (212) 454-6606
    Website: www.rreef.com
    Officers: Timothy K. Gonzalez, CEO, RREEF North America; Brian E. McAuliffe, Managing Director, Acquisitions; Peter F. Feinberg, Managing Director, Portfolio Management

  12. Vornado Realty Trust

    Total Office Portfolio: 32.7 million sq. ft.
    888 Seventh Ave.
    New York, NY 10019
    Phone: (212) 894-7000
    Fax: (212) 894-7070
    Email: information@vno.com
    Website: www.vno.com
    Officers: Steven Roth, Chairman/CEO; Michael Fascitelli, President/Trustee; Joseph Macnow, EVP, Finance & Administration/CFO

  13. ING Clarion

    Total Office Portfolio: 32.3 million sq. ft.
    230 Park Ave., 12th Floor
    New York, NY 10169
    Phone: (212) 883-2500
    Fax: (212) 833-2700
    Email: clientservices@ingclarion.com
    Website: www.ingclarion.com
    Officers: Stephen J. Furnary, Chairman/CEO; Jeffrey A. Barclay, Managing Director/Head of Acquisitions; C. Stephen Cordes, Managing Director/Head of Portfolio Management

  14. Brandywine Realty Trust

    Total Office Portfolio: 28.2 million sq. ft.
    555 E. Lancaster Ave., Suite 100
    Radnor, PA 19087
    Phone: (866) 426-5400
    Fax: (610) 325-5622
    Website: www.brandywinerealty.com
    Officers: Jerry Sweeney, CEO/President; Brad Molotsky, SVP/General Counsel/Secretary; Howard Sipzner, CFO

  15. Hillwood

    Total Office Portfolio: 24.8 million sq. ft.
    5430 LBJ Freeway, Eighth Floor
    Dallas, TX 75240
    Phone: (972) 201-2800
    Fax: (972) 201-2829
    Email: dave.pelletier@hillwood.com
    Website: www.hillwood.com
    Officers: Ross Perot Jr., Chairman; Mike Berry, President, Hillwood Properties; Todd Platt, CEO, Hillwood Investments

  16. Lincoln Property Co.

    Total Office Portfolio: 22.1 million sq. ft.
    500 N. Akard, Suite 3300
    Dallas, TX 75201
    Phone: (214) 740-3300
    Fax: (214) 740-3441
    Email: leverett@lpc.com
    Website: www.lincolnproperty.com
    Officers: Mack Pogue, Chairman; Tim Byrne, CEO/President, Residential Division; Bill Duvall, CEO/President, Commercial Division

  17. Liberty Property Trust

    Total Office Portfolio: 20.7 million sq. ft.
    500 Chesterfield Pkwy.
    Malvern, PA 19355
    Phone: (610) 648-1700
    Fax: (610) 644-4129
    Email: info@libertyproperty.com
    Website: www.libertyproperty.com
    Officers: William P. Hankowsky, CEO; George J. Alburger, CFO; Robert E. Fenza, COO

  18. Highwoods Properties

    Total Office Portfolio: 19.2 million sq. ft.
    3100 Smoketree Court, Suite 600
    Raleigh, NC 27604
    Phone: (919) 872-4924
    Fax: (919) 873-0088
    Email: HIW-IR@highwoods.com
    Website: www.highwoods.com
    Officers: Edward J. Fritsch, President/CEO; Michael E. Harris, EVP/COO; Terry L. Stevens, VP/CFO

  19. SL Green Realty Corp.

    Total Office Portfolio: 19 million sq. ft.
    420 Lexingon Ave., Suite 1800
    New York, NY 10170
    Phone: (212) 594-2700
    Fax: (212) 216-1785
    Email: heidi.gillette@slgreen.com
    Website: www.slgreen.com
    Officers: Marc Holliday, CEO; Andrew Mathias, President/Chief Investment Officer; Gregory Hughes, COO/CFO

  20. Shorenstein Properties LLC

    Total Office Portfolio: 16.2 million sq. ft.
    555 California St., 49th Floor
    San Francisco, CA 94104
    Phone: (415) 772-7000
    Fax: (415) 772-7177
    Email: kmcgettigan@shorenstein.com
    Website: www.shorenstein.com
    Officers: Douglas W. Shorenstein, Chairman/CEO; Glenn A. Shannon, President; Richard A. Chicotel, Managing Director/CFO

  21. Inland Real Estate Group of Cos. Inc.

    Total Office Portfolio: 15.2 million sq. ft.
    2901 Butterfield
    Oak Brook, IL 60523
    Phone: (630) 218-8000
    Fax: (630) 218-8039
    Website: www.inlandgroup.com
    Officers: Daniel L. Goodwin, Chairman; Joe Cosenza, Vice Chairman

  22. Arden Realty

    Total Office Portfolio: 14.4 million sq. ft.
    11601 Wilshire Blvd., Suite 400
    Los Angeles, CA 90025
    Phone: (310) 966-2699
    Email: nikkiwetzel@ardenrealty.com
    Website: www.ardenrealty.com
    Officers: Joaquin de Monet, President/CEO; Robert Peddicord, COO; Kevin Early, CFO

  23. Hartz Mountain Industries Inc.

    Total Office Portfolio: 12.6 million sq. ft.
    400 Plaza Dr.
    Secaucus, NJ 7094
    Phone: (201) 348-1200
    Fax: (201) 348-4358
    Website: www.hartzmountain.com
    Officers: Emanuel Stern, President/COO; Gus Milano, EVP, Finance & Leasing; Irwin Horowitz, EVP, General Counsel

  24. The Alter Group

    Total Office Portfolio: 12.6 million sq. ft.
    5500 W. Howard St.
    Skokie, IL 60077
    Phone: (847) 676-4300
    Fax: (847) 676-4325
    Email: tsilva@altergroup.com
    Website: www.altergroup.com
    Officers: Michael J. Alter, President; Richard M. Gatto, EVP; Randolph F. Thomas, EVP

  25. AEW Capital Management LP

    Total Office Portfolio: 12.05 million sq. ft.
    World Trade Center East, Two Seaport Lane
    Boston, MA 2210
    Phone: (617) 261-9000
    Fax: (617) 261-9555
    Email: aewcapitalmanagement@aew.com
    Website: www.aew.com
    Officers: Jeffrey D. Furber, Chief Executive; Pamela J. Herbst, Principal/Head of AEW Direct Investments; Steven D. Corkin, Principal/Head of AEW Client Service & Marketing