NEW YORKTritec Real Estate Co. Inc. has acquired 41 Research Way in East Setauket, N.Y. for $4.5 million. The seller, GSI Group, was represented by Ray Ruiz, executive vice president with Jones Lang LaSalle’s Long Island office; Marianne Dugan, vice president; and Doug Seale, associate, along with Tamie Thompson and Rick Fahey, managing directors, with Jones Lang LaSalle’s Boston office.

The buyer was represented in-house by Robert Kent, vice president and general counsel.

Totaling 65,000 sq. ft. of office and research space, 41 Research Way is the former headquarters of Quantronix Inc., a subsidiary of GSI Group.

“Given the historic low vacancy at the 1 million-sq.-ft. complex in which the facility is located, it was logical for Tritec Real Estate Co., as master developer of the park, to acquire the building,” said Ruiz.

Located on nearly 6 acres, 41 Research Way is located in close proximity to Stony Brook University Medical Center.