(San Francisco Chronicle) A downtown San Jose building was evacuated and 28 people were sickened Tuesday after an employee trying to clean a refrigerator filled with rotting food mixed two chemicals, releasing noxious fumes, authorities said.The incident forced the evacuation of 325 people from the AT&T building at 3475 N. First St. shortly before noon, said Fire Department Capt. Barry Stallard. Paramedics treated 28 people for symptoms that included vomiting and nausea, and seven of them were taken to hospitals, Stallard said.