North of 42nd Street, south of 59th, and east of Fifth Avenue, Midtown East has four — at least — very distinct areas. Fifth Avenue, which forms the border between the east and west halves of Midtown, is the commercial heart of not just the neighborhood but arguably Manhattan as a whole. Park Avenue, after it emerges north of Grand Central Terminal, is largely a row of office buildings, some of them Modernist masterpieces, along with a few older survivors like St. Bartholomew’s Church and the Racquet and Tennis Club. The southeast corner of Midtown East is dominated by the campus of United Nations buildings and diplomatic offices. Finally, the rest of the eastern half of the neighborhood is largely residential and can feel in some ways like an extension of its neighbors (Murray Hill to the south, the Upper East Side to the north).