The story of Senator Frank Lautenberg leaving his wallet in a New York City taxicab — an honest cabbie returned it — has prompted increased speculation within political circles about the 81-year-old Senator’s residency. Lautenberg’s legal residence is in Cliffside Park, but many Democratic insiders say it is common knowledge that when the New Jersey Senator isn’t in Washington, is real residence is at the Park Avenue apartment of his wife, Bonnie Englebardt, whom he married in 2001. Lautenberg lost his wallet traveling between his gym in Manhattan and dinner at a Big Apple restaurant — one pol wondered how many New Jersey residents who work in Washington cross the Hudson River just to use a gym. This probably isn’t a problem for Lautenberg, given the precedence of other New Jersey officials who live in New York: the residency of New Jersey Supreme Court Chief Justice Robert Wilentz became an issue in 1986 when Governor Thomas Kean reappointed him. Wilentz lived in Manhattan, explaining that his wife’s illness required her to reside near her doctors.