Queen’s Health Systems will begin demolition Monday of the former Hawaii Medical Center hospital in West Oahu.

Parts of the Ewa facility, which has not been updated in 25 years, will be gutted and expanded to double the capacity of its emergency and operating departments when it opens next spring.

Queen’s is spending more than $70 million on renovations, new equipment and the acquisition — the largest in recent history.

Emergency rooms will expand to 23 from 10, while operating rooms will expand to four from two. Two procedure rooms also will be added. The hospital will have an intensive care unit as well as diagnostic imaging and gynecology services, but no obstetrics.