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.
2345 Grand 2345 Grand (formerly the IBM Plaza, IBM Building and Mutual Benefit Life Insurance Company Building) is a high-rise office building in Kansas City, Missouri. It is listed on many sites as being the work of Mies van der Rohe, however, he died in 1969 before the 1977 opening. The work was done by Fujikawa Conterato Lohan & Associates. The International style building is a smaller version of the IBM Plaza in Chicago that is also attributed to Mies.