HAVRE DE GRACE, MD. — In a joint venture with Baltimore-based MCB Real Estate, The Hampshire Cos. of Morristown, N.J., has purchased a 502,678-square-foot warehouse from The Sun Products Corporation for an undisclosed amount. The property is located at 1900 Clark Rd. in Havre De Grace. Sun Products, the manufacturer of Solo Cups, will remain the sole tenant in the building and plans to expand its space by 110,000 square feet.