Question: What building was built earlier,  Manhattan Life Insurance Building or 15 Penn Plaza?

Context paragraphs:
Hotel Pennsylvania: The Hotel Pennsylvania is a hotel located at 401 Seventh Avenue (15 Penn Plaza) in Manhattan, across the street from Pennsylvania Station and Madison Square Garden in New York City.

Supreme Life Building: The Supreme Life Building is a historic insurance building located at 3501 S. Dr. Martin Luther King Drive in the Douglas community area of Chicago, Illinois.  Built in 1921, the building served as the headquarters of the Supreme Life Insurance Company, which was founded two years earlier.  The company, originally known as the Liberty Life Insurance Company, was the first African-American owned insurance company in the northern United States.  Since white-owned insurance firms regularly denied black customers life insurance when the firm was founded, the firm played an important role in providing life insurance to Chicago's African-American community.  The company ultimately became the largest African-American owned business in the northern states and became a symbol of the predominantly black Bronzeville neighborhood's economic success from the 1920s to the 1950s.

New York Life Building: The New York Life Insurance Building, New York, located at 51 Madison Avenue, Manhattan, New York City, across from Madison Square Park, is the headquarters of the New York Life Insurance Company.

Manhattan Life Insurance Company: Manhattan Life Insurance Company, incorporated on May 29, 1850, is a life insurance company domiciled in New York but operates as a subsidiary of Manhattan Life Group in Houston, Texas.

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.

Old Federal Reserve Bank Building (Philadelphia): The Old Federal Reserve Bank Building is a historic bank building located at 925 Chestnut Street on the corner of S. 10th Street in the Market East neighborhood of Philadelphia, Pennsylvania.  The main section was designed by noted architect Paul Philippe Cret in the Classical Revival style influenced by the Beaux-Arts style, and was built between 1931 and 1935.  It incorporated the Penn Mutual Life Insurance Building, built in 1899, with additions made in 1918 and 1925.  Cret designed the formal gardens which were added in 1941 and in 1952-3, a recessed seventh story were added, designed by Harbeson, Hough, Livingston & Larson, the successor firm to Cret.  The building features sculptures of the goddess Athena made by Alfred-Alphonse Bottiau.

Penn Plaza East: The Penn Plaza East complex takes its name for its location near Penn Station in Newark, New Jersey.  Fronting Raymond Boulevard on the banks of the Passaic River, the two office buildings were constructed during a period in the late 1980s and early 1990s when they and numerous postmodern skyscrapers were built near the station and Gateway Center.  While others went up between the station and traditional Downtown Newark, Penn Plaza East is on the Ironbound, or east, side of the major transportation hub.  As of 2010, the buildings were occupied by the Newark headquarters of New Jersey Transit, JOC Group, and Horizon Blue Cross Blue Shield of New Jersey, which owns their building.

Francis H. Kimball: Francis Hatch Kimball (1845–1919) was an American architect practicing in New York City, best known for his work on skyscrapers in lower Manhattan and terra-cotta ornamentation.  He was an associate with the firm Kimball & Thompson.  His work includes the Empire Building, Manhattan Life Insurance Building, and Casino Theatre (Broadway).  All but one of Kimball's work was in the United States.

Canadian Pacific Plaza: Canadian Pacific Plaza is a 383-ft (117 m) tall skyscraper in Minneapolis, Minnesota.  It was completed in 1960 and has 28 floors.  It is the 21st-tallest building in the city.  It is the first major post-World War II skyscraper built in Minneapolis.  It is also the city's tallest building completed in the 1960s.  The New York Life Insurance Building was demolished to make way for this building.  A skyway connects the building to the Rand Tower, Soo Line Building, and US Bank 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.

Supporting paragraphs: Manhattan Life Insurance Building 15 Penn Plaza
Answer: Manhattan Life Insurance Building