High Quality Content by WIKIPEDIA articles! The MassMutual Center is a multi-purpose arena and convention center, in downtown Springfield, Massachusetts, USA. Built in the city`s Metro Center across from Court Square, the facility opened in 1972 as the Springfield Civic Center and was at that time considered to be the largest arena in the region. It was owned and operated by the City of Springfield until 1997, when the city transfered ownership of the facility to the Massachusetts Legislature. Shortly after, ownership was given to the Massachusetts Convention Center Authority (MCCA) who in turn began working on plans to renovate and expand the facility. The two-year project, which began in 2003, included renovations to the 8,000 seat arena and the addition of a state-of-the-art convention center. In 2005, the Center was renamed when Massachusetts Mutual Life Insurance Company entered into a naming rights agreement for the arena and convention center. Its grand opening occurred on October 1, 2005. It is home to the Springfield Falcons of the American Hockey League and the Springfield Armor of the NBA Development League. It is nicknamed "The Nest", because it is home to the Falcons.