One Congress is Boston's newest trophy office asset, standing 43 stories tall and achieved 100% pre-leasing 12 months ahead of building completion BOSTON, May 19, 2025 /PRNewswire/ -- JLL's Capital Markets group announced today that it has arranged a $650 million refinancing for One Congress, a recently delivered, trophy office building totaling 1,008,000 square feet in Boston, Massachusetts.JLL worked on behalf of the borrowers, Carr Properties ("Carr") and National Real Estate Advisors ("National"), to ar ...