<p>Oakland -- After three years under Superintendent Dennis Chaconas, who turned the Oakland public schools into a national model of urban school reform, California's sixth-largest school district is broke and headed for the most expensive takeover in state history.</p>
<p>The 48,000-student district will ask the state for an estimated $100 million bailout. Board members say they will have to consider laying off teachers, increasing class sizes and closing some schools to save money.</p>