The Massachusetts Division of Fisheries and Wildlife has closed its Field Headquarters, in Westborough, to construct a state-of-the-art facility there.

About 100 managers and staff moved to temporary office space at 100 Hartwell Street, Suite 200 in West Boylston over the weekend, state Fisheries and Wildlife Commissioner Mary Griffin said Tuesday.

A modern facility will be erected at the Westborough site, at 1 Rabbit Hill Road, with completion eyed for July 2014, she said.

The current facility will be demolished, she said. Construction will start in early 2013.

Access to the Westborough site from the old Field HQ hill will be closed later this month, Griffin said.

"We don't want people going through the construction site. When the construction is done, that may well be re-opened," she said.

The state has expanded and improved the site's parking lot off Milk Street "in anticipation of the building construction," the agency said on its website.

"Access is also still available from the Fisherman’s Access off Oak Street and the access point at Little Chauncy Pond on Lyman Street, both in Westborough," the agency said.