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William P. O'Brien, SIOR
Office Specialist
Office Specialist, M.C. O'Brien
4718 Avenue N
Brooklyn, NY 11234
United States
Phone: +1.718.252.9191
Cell: +1.917.763.8215
Chapter:   SIOR New York City and Downstate Chapter
Member Since: 1997

Chair, Professional Standards

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William P. O'Brien, SIOR, is a third generation member of M. C. O'Brien, Inc., which is currently the oldest commercial real estate firm operating in Brooklyn. Mr. O'Brien has been associated with the Brooklyn Board of Realtors since entering the real estate business in 1989 and has continued to refine his professional abilities through education, networking and his affiliation with a diverse group of commercial real estate organizations. Specifically, during his tenure at The Brooklyn Board of Realtors he became interested in the Professional Standards and Mediation component of the Realtor Designation and ultimately chaired the Professional Standards and Mediation Committee for a number of years.

Mr. O'Brien has been able to achieve considerable success in terms of retail and office leasing and sales in his 29 years in the business. Aggregate transaction volume is just shy of $2,000,000.000.00. Mr. O'Brien has represented numerous entities in regard to their real property needs in Brooklyn and Queens, including State Farm Insurance, JP Morgan Chase, Rite Aid Pharmacy, Walgreens Pharmacy, Allstate Insurance, the American Red Cross and a host of community-based organizations and entrepreneurs.

Mr. O'Brien earned the hard-to-attain designation of Specialist in Industrial and Office Real Estate (SIOR) in 1997. He was, at that time, one of the youngest people ever to achieve this goal in metro New York. He was President of the Downstate New York Chapter of SIOR in 2008 and 2009, and serves on the National Professional Standards Board, where he has undergone extensive training as an arbitrator and mediator. In addition, he has become a Trustee of the SIOR Foundation, which promotes the commercial real estate industry through a host of educational programs and scholarships. SIOR is viewed by many as the consummate commercial real estate designation, with members required to show proficiency in their respective discipline in either office or industrial brokerage. Members have to demonstrate a minimum amount of aggregate transaction volume and adhere to strict educational requirements as well as professional standards.

The majority of Mr. O'Brien's work focuses on commercial leasing both for tenants and landlords but he is also an active sales broker having secured numerous all cash transactions for his clients with limited due diligence over the last few years. In addition to advising corporate clients, one of his significant niches is working with a wide variety of not-for-profit entities providing services to the diverse Brooklyn and Queens’s marketplace.

Mr. O'Brien became a Board Member of Brooklyn Community Services, formerly The Brooklyn Bureau of Community Service, the largest non-sectarian social service provider in Brooklyn. Recently his tenure was up but he continues to advise BCS in regard to their Real Estate needs.

Mr. O'Brien resides in Rockville Centre, NY with his wife of 26 years, Ann Marie, and their three children, Christopher, Evan and Lauren.

  • Multi Year Costar Power Broker Recipient
  • SIOR
  • University of Vermont and Hofstra University
Areas of Practice
  • Tenant Representation
  • Landlord
  • Sale/Leasing
  • Investments
  • Consulting

William O'Brien, SIOR

M.C. O'Brien
Brooklyn, NY

Jack Britvan, SIOR

Commercial Realty Services of Long Island
Jericho, Long Island, NY

$20,000,000 Office Lease

42,000 sq. ft.

William represented Dime Savings Bank of Williamsburg
Jack represented Dime Savings Bank of Williamsburg

Brooklyn, NY - May 15, 2016

Robert Hebron, SIOR

Ingram & Hebron Realty
Brooklyn, NY

William O'Brien, SIOR

M.C. O'Brien
Brooklyn, NY

$1,350,000 Office Lease

2,500 sq. ft.

William represented Sylvan Learning

Brooklyn, NY - March 2, 2015

William O'Brien, SIOR

M.C. O'Brien
Brooklyn, NY

Robert Hebron, SIOR

Ingram & Hebron Realty
Brooklyn, NY

$539,097 Office Lease

4,000 sq. ft.

William represented Paul J. Cooper Center for Human Sevices., Inc.
Robert represented Paul J. Cooper Center for Human Sevices., Inc.

Brooklyn, NY - February 1, 2015

Lloyd Cooper, SIOR, BCL, LLB, MBA, MCR

Cushman & Wakefield

William O'Brien, SIOR

M.C. O'Brien
Brooklyn, NY

$966,000 Office Sale

Queens, NY - February 1, 2011
Committee History
CommitteeCommittee RoleBegin DateEnd Date
SPB - Tenant Representation 1/1/20061/1/2020
Professional StandardsChair10/1/20169/30/2018
SIOR Foundation Grants & ScholarshipMember10/8/201510/20/2016
SIOR Foundation Board of TrusteesMember10/24/201310/20/2016
Professional StandardsVice Chair10/1/20149/30/2016
GSA Reporter 1/1/200612/31/2015
SIOR Foundation Grants & ScholarshipMember10/23/201410/8/2015
Committee Council LeadershipVice Chair10/1/20149/30/2015
Professional StandardsMember10/31/201310/30/2014
SIOR Foundation Grants & ScholarshipMember10/24/201310/23/2014
SIOR Foundation Grants & ScholarshipMember10/25/201210/24/2013
SIOR Foundation Board of TrusteesMember1/1/201110/24/2013
Viewing past 5 years committees | View all
Conference History
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