MARLBOROUGH, MASS. — R.W. Holmes Realty has completed the $7.15 million sale of a 60,477-square-foot office and laboratory building in Marlborough. Located at 33 Locke Dr., the facility is 95 percent leased to Sepracor, a leading research based pharmaceutical company. Garry Holmes of R.W. Holmes represented the seller, Northland Investment, and Bill Sullivan of R.W. Holmes represented the buyer, Janelon Trust. WRT Management will manage the day-to-day operations of the facility.