Wayne,
I suppose its possible to build a second course up at Sagebrush but I doubt it if is practical to do so.
The course is on land leased from the Douglas Lake Ranch, which, I am told, is the largest ranch in North America. I may be possible to build a course below Sagebrush which would be partially on the same hillside and then into the valley below which is all Douglas Lake Ranch property so a land lease would have to be secured and the likelihood of the ranch agreeing to a further lease is not likely based upon the history of the course and the ranch.
The is a very compact 9 hole course below Sagebrush which is adjacent to the old Quilchena Hotel, all of which is owned by the ranch as well. The 9 hole course is without any features of note at all, gets very little play and is dead flat. That area is also subject to flooding which has occurred on at least two occasions in the last 8-10 years.
To acquire a lease from the ranch would be very difficult. When the course was built, the lease was held by the Quilchena Ranch, but since then, the Douglas Lake Ranch bought the Quilchena Ranch and merged the operations. Douglas Lake and Sagebrush do not have a good relationship, especially since the debacle of Mr. Chandler who bought from the original group and is now sitting in a jail cell in Los Angeles.