The St. Louis Zoo has agreed to buy the St. Louis-area's sprawling animal park known as Grant's Farm, with certain conditions.

The St. Louis Post-Dispatch reports the $30 million deal would triple the zoo's acreage, add a third campus to its holds and allow the zoo to build a "robust" breeding site for endangered animals.

But the deal only goes through if a St. Louis judge agrees with four of six Busch heirs to release the land from a trust. The other stipulation is that area residents approve an added tax to fund as much as $8.5 million in yearly park operation costs.

A-B InBev, which leases the land from the Busch family, has agreed to donate about $27 million to the zoo for the purchase of Grant's Farm.

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