SUN VALLEY, Idaho -

Sun Valley Resort plans to close Sun Valley Lodge for nine months starting in September for an extensive remodel.

Resort officials tell the Idaho Mountain Express that a three-story, 20,000-square-foot spa will also be added to the northerly wing of the lodge near an outdoor swimming pool. Work on the spa is scheduled to start in April.

The resort in the announcement on Monday says the Lodge Dining Room will be eliminated.

Officials say the number of rooms in lodge, built in 1936, will drop from 148 to about 100 as smaller rooms are combined to make more luxurious rooms.

Officials say they will work to maintain the character of the historic building.