Richard A.Danesi, senior managing director at Insignia/ESG's Saddle Brook, NJ office, represented the new tenant. The sublessor, United Health Care Services Inc., was represented by Trammell Crow Co.

OneBeacon Insurance Group is wholly owned by White Mountains Insurance Group Ltd., based in Hamilton, Bermuda. White Mountains' principal businesses are conducted through its various subsidiaries and affiliates in the property/casualty insurance and reinsurance business.

"This is an important lease transaction at Basking Ridge Corporate Center," according to Danesi. "We're finding that we are continuing to generate significant results in this marketplace."

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