WALTHAM, MASS. — NKF Capital Markets has brokered the $86 million sale of CenterPoint, a 440,000-square-foot office complex in Waltham. The property comprises two buildings, 41 Seyon St. and 43 Foundry Ave. Edward Maher, Matthew Pullen and Robert Griffin of NKF Capital Markets represented the seller, Rubenstein Partners, in the transaction. The buyer was Hilco Real Estate. Anchor tenants at the property include Repligen, EDC (Education Development Center) and Simpson Gumpertz & Heger.