PHOENIX — The Oakland A's and the City of Mesa have finalized a deal that will have the A's moving to HoHoKam Park in Mesa in 2015 for a run of at least 20 years.

The deal struck is for a base of 20 years with a pair of five-year options that could extend the deal to three decades.

The A's will play their games at HoHoKam, which will be undergoing renovations in 2014 after the Chicago Cubs move out, and Oakland will have a complex of four workout fields at nearby Fitch Park, which is also undergoing a face lift.

"We are extremely excited about our future spring home,'' A's managing general partner Lew Wolff said in a statement. "With the improvements planned over the next two years, we believe HoHoKam Stadium and surrounding facilities will rival any in Major League Baseball."

The Mesa City Council approved the deal Monday night, the agreement calling for $20 million in renovations, $17.5 million coming from the city and $2.5 million coming from the A's. Mesa will have part of its cost defrayed by a funding contribution from the Arizona Sports and Tourism authority totaling $8.2 million.

The A's were the original tenants at HoHoKam and trained there from 1969-78. They then spent three years in Scottsdale before moving to Phoenix Municipal Stadium in 1982.

Mesa is building a new facility for the Cubs that will be called Mesa Riverview and will be ready to go for the spring of 2014.