A total of 194,000 sf of space will serve as the headquartersfor Regeneron Pharmaceuticals Inc. The new construction willinvolve the development of three interconnected laboratory andoffice buildings to be built on a 66-acre vacant parcel adjacent tothe existing 777 and 765 Old Saw Mill River Rd. buildings at the752,000-sf Landmark at Eastview complex. The new project will bringthe development to more than one million sf of research and officespace.

Regeneron will occupy all of one and two-thirds of another ofthe new buildings. The remainder of the second and third buildingswill be built on spec, according to BioMed Realty officials,another rarity in the commercial real estate market in WestchesterCounty.

The pharmaceutical firm, which began operations at the Landmarkproperty with four employees in 1988, will be consolidatingoperations from multiple properties into its new space that will bethe new home for its 450 workers. Regeneron has signed a long-termlease for 194,000 sf of new space and has also agreed to retain27,000 sf of existing space at the property.