From Tenant to Owner: Cash-Rich Regeneron Pays $720 Million for HQ

Regeneron Pharmaceuticals, a rapidly growing biotechnology company, has taken steps to purchase its headquarters property at 777 Old Saw Mill River Road for $720 million.

For more than 25 years, Regeneron — which has grown to more than 5,000 employees, including about 2,500 based in Westchester — has been a tenant at the Landmark at Eastview campus that straddles the towns of Mount Pleasant and Greenburgh.

The company recently signed a purchase agreement for the 150-acre campus with its current landlords, BMR-Landmark at Eastview LLC and BMR-Landmark at Eastview IV LLC, affiliates of Biomed Realty, according to a document filed with the Securities and Exchange Commission.

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