(CBS) The Chicago Cubs have exercised an option in their contract with WGN-TV that will end the agreement following the 2014 season.

The team reportedly notified the Tribune Co.-owned station on Tuesday that it had 30 days to meet a higher assessed fair market value for the broadcast rights.

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After the 30 days, the team would then be free to explore other broadcast options for the roughly 70 games televised each season by WGN.

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The Cubs relationship dates back to 1948.

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A Cubs spokesman reportedly declined to comment.