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Leadership Team

About us

Our Team

Eric Sobotka, MAI

Chief Appraiser

C: 248-251-5331

Prior to forming Gravitas Valuation, Eric was an appraiser/analyst with Integra Realty Resources- Sacramento (IRR), The Fillmore Group (now IRR – San Francisco) and Pacific Appraisers. He also held several development and acquisition roles with a number of regional developers where he was involved in the acquisition, entitlement, and/or development of over $500M in multifamily, self storage, retail properties. Eric received his Bachelor’s degree in Economics from the University of California Davis and is a licensed Real Estate Broker in CA & MI, and a Certified General Real Estate Appraiser in MD, DC, VA, IA, CA, CO, NC & MI.
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Boris Maslow

Advisors

Boris is a Certified Residential Appraiser based in the Baltimore area with over 18 years of experience. He brings a broad background working with both lenders and private clients, giving him a well-rounded understanding of the factors that influence property values in the local market. In addition to his appraisal work, Boris has renovated multiple single-family homes, providing him with in-depth knowledge of construction costs and the renovation process.

Mark Montag

Advisors

Mark is a Certified General Appraiser with over 30 years experience working primarily in the fuel distribution sector. His appraisal experience spans a variety of commercial assets, including bulk oil terminals, propane companies, fueling stations, convenience stores, and service sites. Prior to entering the appraisal field, Mark spent eleven years in the financial services industry, serving as Vice President at two suburban institutions and overseeing the valuation and sale of bank-owned properties in five states. Mark holds an MBA and a Bachelor’s degree from the College of St. Thomas.

Gordon Bergthold

Advisors

Gordon is a Certified General Appraiser in California with over 55 years appraising commercial and agriculture properties throughout the United States. He is a member of the American Society of Farm Managers and Rural Appraisers (ASFMRA) and has extensive experience as an expert witness. He also specializes in water rights and arbitration/mitigation.
Gravitas Valuation is a national real estate appraisal and valuation firm providing independent, USPAP‑compliant reports for lenders, attorneys, investors, and property owners
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