Allen started his career with Coldwell Banker Commercial (now CB Richard Ellis) in 1984 after graduating from the University of Maryland School of Law in Baltimore. Since entering the industry, Allen has had 37 years of transactional experience in commercial real estate and business brokerage, including leasing and sales in office, retail, industrial, multi-family and medical properties, business sales in conjunction with real property, and land sales for industrial, hospitality and residential development.

Before founding B2B Business Brokers and specializing in mid-market Business Brokerage, Allen was Designated Broker for eXp Commercial in Washington, a subsidiary of EXPI (NASDAQ), an international real estate conglomerate founded in Bellingham in 2009. He was responsible for developing the business and commercial real estate brokerage operation throughout Washington State and served as a Mentor for upcoming commercial real estate brokers.

Prior to that Allen founded and operated Kulshan Commercial Investment Real Estate, a boutique investment brokerage in the pacific northwest; started a commercial division for KW Commercial operating covering the Seattle metro area; owned and operated a Sperry Van Ness franchise in Utah; opened the Park City office for Colliers Commerce CRG; served as Director of Commercial Real Estate for Prudential Utah.

Additionally, Allen has worked in Site Acquisitions nationally in the automobile emissions inspection industry, PCS mobile communications (cell towers), oil shale, large scale wind projects and solar installations on commercial buildings and land.

Throughout his extensive career in commercial real estate, Allen has stayed active within his community. 

Stockbridge served as Charter Chair for The Event for the Hungry, the Cold and the Homeless; Charter President of the Rotary Club of Towsontowne; Charter President of the Rotary Club of Park City Sunrise; and Charter President of the Park City Toastmasters Club. 

He also served as Charter Chair of Park City Singers, and was a member of Class 6 of Leadership Park City and the Leadership Skagit Class of 2016. He is currently a member of the Rotary Club of Amherst (MA).