Boston Globe negotiating with potential buyer for headquarters

The newspaper’s building and 16.5-acre site on Morrissey Boulevard in Dorchester were put on the market in April.John Ioven/Boston Globe staff

The Boston Globe is in negotiations with a potential buyer for its building on Morrissey Boulevard.

The buyer is Winstanley Enterprises of Concord, a commercial developer that plans to turn the 16.5-acre Dorchester site into a mixed-use property, according to the Globe’s chief executive, Mike Sheehan.

The Globe said in April that it had hired Colliers International to solicit bids for the 815,000-square-foot newspaper plant and headquarters, and the surrounding property. A number of parties expressed interest in September, and the company met with the three most favorable bidders.

A purchase-and-sale agreement has not yet been signed. In a memo to employees Tuesday, Sheehan said, “there are still details to be worked out and a period of due diligence” before a deal is completed. No price has been disclosed.

Winstanley Enterprises was founded 1990 and is run by David Winstanley and his sons, Adam and Carter. The firm owns 43 buildings, totaling 5.5 million square feet throughout New England, including commercial and industrial properties, biotechnology labs, and retail space, according to its website.

The Globe is working with Colliers to find new sites for the Globe’s newsroom and business operations, as well as its printing operations.

In addition to its own paper, the Globe prints The New York Times, the Boston Herald, The Patriot Ledger, The Enterprise of Brockton, and, most days, the Worcester Telegram & Gazette.

Sheehan said the company was evaluating options “in a number of locations” around Boston. A move is planned for late 2016 or early 2017, he said.

The Globe moved in 1958 from Boston’s Newspaper Row on Washington Street to its current location, just south of downtown. The large facility is across the street from the University of Massachusetts Boston and houses about 1,400 full- and part-time employees, about 500 of whom work on printing and packaging newspapers.