Phoenix is negotiating with the Milwaukee Brewers in an effort to extend the ballclub’s spring-training stay at city-owned Maryvale Baseball Park.

City officials said they could enhance the current facility with $12 million from the Arizona Sports and Tourism Authority. However, those funds would not be available until 2020.

Phoenix could pay for any improvements sought by the Brewers, and then be reimbursed by the AZSTA, which was established to finance baseball spring training facilities in Maricopa County with bonds supported with revenues from dedicated hotel and rental car taxes.

The Major League Baseball team has the option to leave the park after 2012, but has not said whether it is considering a move.

A spokesman for the Brewers said the team would not discuss stadium ­negotiations.

The Brewers have been training at Maryvale since 1998 under the terms of a 15-year agreement that will expire in 2012. The team has the option for two two-year extensions.

The current facility includes practice fields, clubhouses, and a baseball stadium that can seat 10,000 people.

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