Denison's more than forty years in the real estate industry started in the early 1970s with the Rouse Company in Washington, D.C., where he was responsible for mortgage banking services. From 1973 to 1975, Mr. Hall was Vice President of Mitchell Mortgage & Development, Houston, TX. In 1977, he became the Executive Vice President for Greater Boston Development, Inc. now known as Boston Capital Services, Inc., Boston, MA. Under his leadership, the company acquired interests in nearly 25,000 multi-family units. In 1989, he co-founded Hall Properties, Inc., a real estate investment and development firm.

Mr. Hall has focused his attention on the acquisition and development of commercial real estate, both for his own account and for institutional clients. He has substantial experience in the acquisition and development of office, R&D, retail, biotech, industrial, and multi-family properties. In addition to his interest in 2300 units of affordable housing and Assisted Living, Mr. Hall has interests in a portfolio of 360,000 square feet of office and flexible industrial property. Past projects include the acquisition, renovation, and sale of a 400,000 SF suburban office campus in Concord, MA; the acquisition, renovation, and sale of a 500,000 SF suburban office campus in Marlborough, MA, and the acquisition, renovation and new construction of 300,000 SF biomedical facility in Cambridge, MA. Mr. Hall is a graduate of Yale University.