WALTHAM, MASS. — NKF Capital Markets has arranged the sale of Stony Brook Office Park in Waltham. Jumbo Capital and Sound Mark Partners acquired the office park for $80 million. Robert Griffin, Edward Maher, Matthew Pullen, James Trible and Samantha Hallowell of NKF Capital Markets represented the seller, Clarion Partners, in the deal. Situated on 16 acres, the office park comprises four interconnected buildings totaling 270,196 square feet of institutional-quality office space at 130 Turner St. and a 3,925-square-foot retail asset at Five Turner St. At the time of sale, the property was 100 percent leased, anchored by Brainshark, Wolters Kluwer, TIAA, Stanley Black & Decker, Ultratech, DDJ Capital Management and Wells Fargo.