Orlando-based Florida Hospital is getting ready to open a new $255 million building that holds space for 440 patient rooms and an emergency department that could span a football field. The tower's purpose is to replace the hospital's existing, overcrowded ER and expand its cardiac services. Construction began in 2006, and hospital officials expect to start using patient rooms this month. The emergency department is to open in December with 50 treatment rooms for adults and eight for children.