WARSAW, Poland (AP) _ Michael Jackson hopes to sign a final agreement in May to build a $500 million amusement park in Warsaw, but only if a question over who owns the site is resolved.

The pop star wants to use an old military airport, but the Defense Ministry must first transfer ownership to a government agency, the pop star's representative in Poland, Jacques Tourel, said Tuesday.

Jackson, who visited Poland last year to scout sites, will return in May to sign the deal if all the terms are met, Tourel said. The first part of the 222-acre park could open June 1, he said.