New York City’s biggest townhouse sale this year wasn’t Jeffrey Epstein’s former Upper East Side mansion. It was an office building turned single-family home two blocks away. Real-estate investor David Levinson, chairman and CEO of L&L Holding, has closed on the sale of his Upper East Side row house at 11 East 69th Street for $53.5 million, according to newly released property records. The contract signing was reported in March, pegged at “over $50 million”