July 6, 2026
Summer Street Advisors today announced that Mark Thompson has joined the firm as Director of Sales. In this role, Thompson will lead business development initiatives and client relationship efforts across the commercial real estate industry, drawing on more than 25 years of experience in real estate finance, capital markets, alternative investments, and institutional distribution.
“We are thrilled to welcome Mark to the Summer Street Advisors team,” said Jack Mullen, Founder and Managing Director of Summer Street Advisors. “His deep relationships across the lending, private equity, and institutional investor communities, combined with his track record in capital formation, make him an invaluable addition as we continue to deliver value to our clients and partners.”
Prior to joining Summer Street Advisors, Thompson served as Director of Debt & Equity at Calamar, where he originated and structured debt and equity solutions for development and investment projects nationwide. He previously led national accounts and capital formation efforts at Sequence Financial Specialists and held senior roles at Merrill Lynch, CME Group, and UBS Securities.
Throughout his career, Thompson has worked extensively with lenders, private equity firms, developers, family offices, RIAs, and institutional investors, building a broad network across the capital markets and commercial real estate landscape.
“I’m excited to join Summer Street Advisors at such a pivotal time for the firm,” said Thompson. “I look forward to leveraging my experience in capital markets and institutional distribution to deepen client relationships and drive growth across our business development efforts.”
Thompson earned a BA in Business Administration and Management from Villanova University and holds FINRA Series 24, 7, 65, 63/66, and 55 registrations.
About Summer Street Advisors, LLC
Summer Street Advisors LLC is a commercial real estate advisory services firm founded by Jack Mullen, an alumnus of GE Capital Real Estate.
SSA offers a full range of advisory services across Transaction Management, Capital Markets, and Asset Management, providing highly experienced strategic advisory services to sponsors/developers, financing institutions, debt and equity fund investment managers, insurance companies, pension funds, and family offices. SSA’s senior team has hands-on experience across all major U.S markets and asset classes for structured equity and debt investments, including distressed assets and CMBS securities.
About Jack Mullen of Summer Street Advisors:
As Founder & Managing Director of Summer Street Advisors, Jack Mullen leverages decades of experience in valuation, underwriting, and risk management to lead multi-million and multi-billion dollar CRE transactions.
Previously with GE Capital and large institutional banks, he has shaped investment strategies for some of the industry’s largest deals. A recognized leader, his insights are featured in GlobeSt.com and CREFC Finance World, and he is a sought-after speaker at industry conferences and top universities.
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