"I know it's them," one industry professional tells GlobeSt.com about a group led by veteran Boston real estate broker William Zielinski. Now a senior vice president at Meredith & Grew in Boston, where he has been since 1990, Zielinski anticipates building as much as 600,000 sf of high-end office space at the Southborough property, according to the source, who maintains the concept will be well-received by the tenant community. "It's a fantastic location," the source says. "I think they will do extremely well." The parcel sits along Route 9 near with quick access to both Interstate 495 and the Massachusetts Turnpike.

Observers say Verizon is expected to remain at 325 Turnpike Rd. for a limited period, most likely through a sale-leaseback arrangement. Verizon has used the facility chiefly for warehousing of equipment and supplies.

The complex was marketed by CB Richard Ellis/New England on behalf of the sellers. Calls to brokers and Zielinski were not returned by deadline.