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Mark O'Brien

First Vice President

Global Workplace Solutions

License: Lic. 01120143

Mark O'Brien First Vice President
Global Workplace Solutions Lic. 01120143
Los Angeles Downtown 400 S. Hope Street
25th Floor
Los Angeles, CA 90071

Professional Experience

Mark D. O’Brien, a First Vice President in CBRE’s headquarters in Los Angeles, represents single tenants and corporate tenants in the acquisition, leasing, and disposition of commercial office property.  Mark also represents institutional owners in the leasing of their properties.  He assists companies in making the best business decision by diagnosing client business needs and analyzing alternative real estate solutions.  He aggressively represents client interests in site selection, financial analysis and lease negotiations.

Mark has ten years of transactional experience in Downtown Los Angeles and the surrounding markets.

Prior to joining CBRE, Mark owned his own property management company for seven years. 

Mark is a licensed real estate professional in the state of California.  He is a member of CBRE’s Technology Practice Group, which is dedicated to servicing the fast-paced growth of the technology industry. 

He is also an active member of his community, volunteering for various roles and responsibilities with AYSO, and Little League.


  • Pacific Leader of the Intellisite Group for CBRE Worldwide
  • Gained recognition by being frequently mentioned in The Los Angeles Business Journal and The Downtown News


  • California State University at Fullerton, Bachelor of Science, Business Administration/Economics



  • Caldwell, Leslie, Necombe & Pettit
  • IKON
  • Verizon
  • GMAC
  • Bank One
  • AT&T
  • RR Donnelley
  • Land Bank of Taiwan
  • Wright, Robinson, Osthimer & Tatum
  • Hua Nan Commercial Bank
  • Taiwan Business Bank
  • The Farmers Bank of China
  • Seebach & Seebach
  • Capital Risk
  • Sumitomo Mitsui Banking Corporation
  • Hitachi Consulting
  • Kennerly Lamishaw & Rossi
  • Boston Partners
  • Davis & Company
  • Matura Farrington
  • Mesirow Financial
  • State of California


  • Alliance Commercial Partners
  • Broadway Partners
  • Transwestern Commercial Properties
  • Carlyle Group

Major Transactions

  • Global Crossing
    81,000 SF
  • Carat USA
    38,000 SF
  • How 2 TV
    28,000 SF
  • American Express
    25,000 SF
  • Coudert Brothers
    25,000 SF
  • Davis Wright & Tremaine
    25,000 SF
  • Vertex Group
    20,000 S
  • Pacific Gateway Exchange 
    16,000 SF
  • Enron Communications 
    12,000 SF
  • DDI 
    10,000 SF
  • Verio Southern California
    8,000 SF
  • Caldwell, Leslie, Newcomb & Petite
    15,000 SF
Mark O'Brien First Vice President
Global Workplace Solutions Lic. 01120143
Los Angeles Downtown 400 S. Hope Street
25th Floor
Los Angeles, CA 90071