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.
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.