Real Estate Expert Witness

I have thirty -two (32) years of commercial real estate experience and can provide expert advice, analysis, opinion reports, and legal testimony to attorneys and their clients in real estate disputes.

  • Consultation: I provide consultation on various aspects of commercial real estate, helping the parties understand complex real estate concepts and how they apply to the case at hand.
  • Report Preparation: I personally prepare detailed expert opinion and rebuttal reports that can be used as evidence in court. These reports encompass my methodologies, findings, and conclusions.
  • Analysis and Testimony: I offer detailed analysis and expert testimony and have deposition and trial experience.
  • Market Analysis: I regularly conduct market analysis to provide context about the real estate market conditions at a specific time, which can be critical in understanding the circumstances around a dispute or transaction.

Why hire me?

  • Broad range of commercial real estate expertise.
  • Dependable and responsive.
  • Trial experience as expert witness.
  • Licensed Real Estate Broker (CA License 01125276) with MBA
  • Nationwide experience.
  • Contact me today to discuss your case.


Greg Libby, MBA

Expert Witness – Educator – Consultant – Real Estate Broker

Libby Consulting, LLC

Los Angeles

11150 West Olympic Blvd.
Suite 1050 PMB 1058
Los Angeles, CA 90064

San Diego

11956 Bernardo Plaza Drive #1008
San Diego, CA 92128


Los Angeles Telephone: +1 (310) 691-1992

San Diego Telephone: +1 (760) 688-6795

California DRE License #01125276

32 Years of Experience

Course Facilitator – Commercial Real Estate

Cornell University

April 2024 – Present

Part time role teaching online commercial real estate courses in the eCornell certificate program.


Libby Consulting, LLC

July 2019 – Present

Big picture and individual project strategist who can understand and advance company objectives, define risks and opportunities, and deliver targeted results. Leader with strong business acumen and record of leading operations, financial, and analysis to discover opportunities, strengthen internal and external relationships, and deliver desired outcomes. Expert witness on commercial real estate matters with both deposition and trial experience.

Senior Vice President
Hughes Marino
Jan 2019 – Jul 2019

As a Senior Vice President of the Portfolio Lease Administration and Advisory team, Greg helped clients manage their lease obligations on a regional, national and global portfolio level. Greg and the team allowed clients to save resources, reduce risk and avoid costly oversights in the management of their lease portfolio.

Associate Vice President
Realty Income Corporation
Jan 2009 – Dec 2018

Served in broad range of hands-on and management roles including Head of Property Management leading and developing property management team accountable for operations on national portfolio of commercial properties. Realty Income is a publicly traded REIT (listed under symbol “O” on the NYSE). Developed internal team of property managers, construction, development, finance, and administrative professionals and worked with executive team members. Managed diverse property types consisting of retail, distribution, warehouse, and office properties. Responsible for creation and ongoing success of a large-scale capital construction plan and project management for the maintenance, repair and replacement of roofs, parking lots, and HVAC equipment on a national portfolio. Accountable for operating expense budget, capital expense budget, and maintaining key vendor relationships.

Real Estate Manager
Islands Restaurants, L.P.
May 2006 – Jan 2009

Developed and managed relationships with architects, brokers, city staff, consultants, developers, engineers, landlords, other real estate representatives, executive management team, and internal management personnel. Ensured compliance with lease requirements and achievement of company goals by personally working with landlords and overseeing activities of a third party lease management firm. Developed and directed strategic market analysis and multi-state expansion/contraction plans for +/- 60-unit casual dining restaurant company. Financial and property due diligence, negotiated purchase agreements, new lease agreements, renewals, and early terminations on retail and office properties in multi-state portfolio.

Asst. Vice President
Wall Street Property Company
Jul 1994 – Apr 2006

Developed and directed management and leasing plans for owner of multi-state portfolio of shopping centers. Participated in exchanges with tenants, brokers, consultants, lenders, joint venture partners, and internal/external management personnel on complex commercial real estate development projects. Negotiated documentation, managed due diligence process, and directed loan closing process on many difficult commercial real estate loan transactions.


University of Phoenix
Masters of Business Administration (M.B.A.)

University of San Diego
Bachelor of Business Administration – Business Economics

Real Estate Broker License

State of California
License #01125276

Frequently Asked Questions

A Daubert Challenge is a legal objection raised in court, questioning the qualifications of an expert witness. It is an argument by the opposing counsel that the expert witness lacks the necessary knowledge, skills, experience, training, or education to provide a credible opinion on the relevant issue.
Yes. Mr. Libby can interpret and clarify lease agreements, assess whether lease terms have been violated, and determine appropriate remedies for breaches of lease agreements.
Yes. In cases where property management services are at issue, Mr. Libby can assess whether property managers fulfilled their responsibilities, maintained the property appropriately, and complied with industry standards.
Yes. Mr. Libby can opine on disagreements between parties in a real estate transaction, including issues related to broker commissions, fiduciary duties, or misrepresentation.
Yes. Mr. Libby may opine on whether adequate due diligence was conducted in a commercial real estate transaction or whether negligence on the part of professionals contributed to a dispute.
Yes. Mr. Libby is qualified to opine on disputes that involve disagreements over the fair market value of a commercial property, or disputes between partners or shareholders.

Free Expert Witness Consultation