By CBS3 Staff

PHILADELPHIA (CBS) – Today is Columbus Day, which is a federal holiday, and in Philadelphia all city buildings and services are closed. A lot of people are wondering why the city still observes the holiday, especially since over the summer they boxed up the Christopher Columbus statue in South Philly.

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It turns out, all city holidays are tied to the collective bargaining agreements made between the mayor’s office and the city’s four municipal unions.

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All of the unions and the mayor’s office would have to agree to a change.

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The current contract expires in June, so it is possible this could be the last Columbus Day in Philadelphia.