What building was built earlier,  Manhattan Life Insurance Building or 15 Penn Plaza?
Manhattan Life Insurance Building The Manhattan Life Insurance Building was a 348 ft tower at 64-66 Broadway in New York City completed in 1894 to the designs of the architects of Kimball & Thompson and slightly extended north in 1904 making its new address 64-70 Broadway. It was the first skyscraper to pass 100 m in Manhattan.
20 Exchange Place 20 Exchange Place is a 57-story Art Deco building in the Financial District of Lower Manhattan, New York City. Formerly known as the City Bank-Farmers Trust Building, it was built between 1930–1931, for the newly merged National City Bank of New York and the Farmers' Loan and Trust Company, predecessor firms of Citigroup. It remained the company's headquarters until 1956 and was ultimately sold in 1979.