UnitedHealth Group's Optum health services division is getting a sprawling new headquarters to go with its increasingly bold status within the health care giant's corporate strategy.

Minnetonka-based UnitedHealth said it closed on a deal Thursday to purchase the former headquarters of ADC Telecommunications Inc. in Eden Prairie. Terms were not disclosed in regulatory filings.

UnitedHealth announced in April it would merge three businesses under the single Optum brand to better coordinate business operations and improve marketing.

Workers at those businesses -- the wellness and behavioral services company OptumHealth, the information and research company OptumInsight (formerly Ingenix) and the prescriptions business OptumRx -- have been spread across several locations in the Twin Cities.

Optum now has a combined workforce of 30,000. Some employees will begin moving into the space during the next few months, but it's unclear whether all will move to the new location, Optum spokesman Brian Kane said.

He said the facility is the "ideal place" for Optum's various service divisions "to come together, collaborate and really serve our clients with the full range of capabilities we have to offer."

The three-building ADC complex sits on nearly 90 acres of land at 13625 Technology Drive, south of Hwy. 212. It has an estimated market value of $44 million, according to Hennepin County property tax records. With 450,000 square feet of office space, it could cost $112 million to $135 million to rebuild in today's market, commercial real estate brokers estimate.

ADC Telecommunications, which developed the site in 1999 during a period of rapid growth, never regained its footing when the dot-com bubble burst. ADC company sold itself to Swiss-based Tyco Electronics last year for $1.25 billion and put the mostly empty complex on the market in February.

The deal ranks as one of the area's biggest commercial real estate sales since the recession began, and the third-largest in the past 12 months, according to LoopNet. The two largest, 50 South Sixth Street and the TCF Tower in downtown Minneapolis, were both investment-driven transactions.

Jackie Crosby • 612-673-7335