The mayor and a top state lawmaker on Friday called for a meeting to resolve a power struggle at ground zero, with growing momentum to build fewer skyscrapers than planned in an uncertain economy. Mayor Michael Bloomberg invited the governors of New York and New Jersey, Assembly Speaker Sheldon Silver, the agency that owns ground zero and trade center developer Larry Silverstein to a meeting at his mansion next week. The developer and the Port Authority of New York and New Jersey are in stalled, bitter talks to renegotiate Silverstein's lease at the site for the second time since the Sept. 11, 2001, terrorist attacks. Silverstein has rights to build three of five planned office towers and controls development on the eastern half of the site, where the Port Authority is building a $3.2 billion transit hub. The Port Authority is building a 1,776-foot (541-meter) tower and has rights to build a fifth tower.