Former president Richard Nixon’s grandson, Christopher Nixon Cox, has sold his Upper East Side co-op to a victim of Bernard Madoff’s Ponzi scheme. The two-bedroom, two-and-a-half bathroom apartment on East 70th Street between Madison Avenues and the Park overlooks the Frick Museum gardens. Gerald Berkman of Boca Raton, Fla. purchased the 1,000-square-foot spot for $1.4 million after a price reduction. Rica Tarnoff of the Corcoran Group had the listing. [Curbed]