I posted this in the Mysteries thread, but I'm sure the minutiae there has turned some folks off.
The first article below is taken from the Feb. 1917 edition of Golf Illustrated. It lists a number of courses designed by Charles Blair MacDonald prior to that date, including a private course for Otto Kahn. We know about Oheka (lka as Coldstream) on Long Island, which is credited to Seth Raynor in 1923 (with Kahn doing much of the bunker work). So what course is the article discussing?
There's an old thread in which Steve Shaffer linked to a New York Times article from July 7, 1920 discussing the sale of Kahn's Morristown, NJ estate and his plans to move to his new Cold Spring Harbor property on Long Island. The article notes the existence of an 18 hole course at "Cedar Court." I've also attached a modern aerial of the location of Cedar Court.
Was this an unknown CBM design?