What building was built earlier,  Manhattan Life Insurance Building or 15 Penn Plaza?
15 Penn Plaza 15 Penn Plaza, also known as the Vornado Tower, is a proposed 68-story tower in the Midtown Manhattan section of New York City planned by Vornado Realty Trust. It would have 430 units and 2,050,000 square feet (190,451 m²) of floor space. The Hiller Group is the designer. Despite only having 68 floors, it would be just 10 m shorter than the Empire State Building, which has 102 floors.
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.