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In page Larry Silverstein:

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Silverstein became involved in real estate, together with his father, Harry G. Silverstein, and then friend and brother-in-law, Bernard H. Mendik. In 1957, they established Silverstein Properties, as Harry G. Silverstein & Sons, and bought their first building, in Manhattan. Mendik and Silverstein continued the business after the elder Silverstein's death in 1966. In 1977, Mendik divorced Annette Silverstein Mendik, with the business partnership also splitting up at that time.[3] Mendik also cited disagreements over real estate strategies, with Mendik wanting to buy buildings while Silverstein wanted to build.[4]