San Leandro Hospital and its emergency room would stay open for at least three more years under a deal Alameda County Medical Center has put together. San Leandro and Alameda County each agreed this week to pay $3 million over three years to help cover costs. ACMC, which is an independent entity separate from the county, also would contribute $3 million. As part of the deal, ACMC would own and operate the hospital. The hospital is losing money, though Sutter has not released exact figures. ACMC would need an estimated $6 million a year to keep the hospital open, San Leandro City Manager Chris Zapata said last week.