Sale of Biogen’s Kendall Square HQ Would be One of the Most Expensive Deals in Boston This Year

Biogen’s brand new headquarters building in Kendall Square is about to be sold in one of the richest real estate deals in the Boston area this year.

The real estate arm of financial services giant TIAA-CREF said Tuesday that it has a deal to buy a 70 percent stake in the building at 225 Binney Street in Cambridge from Alexandria Real Estate Equities. Biogen moved in last year.

A regulatory filing by Alexandria said the transaction is worth $190.1 million, which would value the entire 305,000 square-foot building at $271.6 million or $889 per square foot.

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