Panama Maritime Authority, one of the world’s largest organizations offering flag inspections for ships, has decided to hold on to its U.S. headquarters berth at 369 Lexington Ave. The organization, an autonomous agency of the Republic of Panama, renewed its five-year lease for 5,588 square feet on the 14th floor of the 28-story building on the corner of Lexington Avenue and East 41st Street. Asking rent was $42 a square foot. “They wanted to stay in the Grand Central submark