It would be hard to find a development firm with a bigger or more consistent impact on Connecticut than Winstanley Enterprises.
The Concord, Massachusetts-based developer, headed by brothers Adam and Carter Winstanley, for years has been a major force in logistics development north of Hartford and in the creation of a growing bioscience sector in New Haven.
The firm continued investing in new warehouse and logistics sites in 2023, even as interest rates soared and economic jitters prompted lenders to tighten their purse strings. Under the direction of Adam Winstanley, the company paid $122.3 million for a 1-million-square-foot Windsor warehouse housing an Amazon fulfillment center. Two months later, it paid $4.6 million for a 133.6-acre Enfield site already approved for 600,000 square feet of logistics space.
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Winstanley is partnering with Kansas City-based NorthPoint Development to build a roughly $135 million, 819,000-square-foot warehouse on Bacon Road in Enfield this year.
In the center of New Haven, Winstanley is putting the finishing touches on a 10-story, 525,000-square-foot life sciences tower, an effort led by Carter Winstanley.

The building is welcoming its first tenants, including Alexion Pharmaceuticals and BioLabs, at the start of 2024.
In October, BioCT, a trade group representing the state’s bioscience industry, welcomed Carter Winstanley to its board, a reflection of his importance to the sector.