The section from 125th Street and the Triborough Bridge ramp south to 92nd Street was completed in 1936. The sections from 92nd Street down to Battery Park (with the exception of a section from 42nd to 49th Streets, located underneath the headquarters of the United Nations) were built as a boulevard running at street level. The first "downtown" section of the boulevard, between Grand and 12th Streets, was completed in June 1937. Two more downtown sections, from 12th to 14th Streets and then from 14th to 18th Streets, were opened in 1939. A short connector from Grand to Montgomery Street was completed in May 1940, which meant that the boulevard was now continuous from Montgomery to 30th Streets. The next month, a large stretch from 49th to 92nd Streets opened. By this point, the only contiguous section that remained to be completed was the stretch between 30th and 49th Streets.