Officials with Arvinas announced Tuesday the company has signed a 10 year-lease for three of the 10 floors in the building, or about one-third of the space in the 500,000-square foot-building. Massachusetts-based Winstanley Enterprises is developing the multi-tenant project, with construction scheduled to get underway by the end of June, according to company officials. Arvinas is expected to move into its portion of the building in 2024. The company will remain in its existing office and lab space in Science Park, in the city’s Newhallville section. Arvinas moved into Science Park in 2013 into about 8,000 square feet of space, according to Cassidy. It currently occupies 63,000 square feet in Science Park and employs about 200 people, he said. New Haven Mayor Justin Elicker called the company’s decision “an exciting milestone for Arvinas, New Haven, and Connecticut.” Paul Pescatello, senior counsel and executive director of the Connecticut Business & Industry Association’s Bioscience Growth Council, said what Cassidy is describing is the natural order of how a region develops into a biotech cluster.