heres what i got with a simple google search
The Timberline Lodge on Mt. Hood in Oregon was used for the front exterior, but all the interiors as well as the back of the hotel were specially built at Elstree Studios in London, England. The management of the Timberline requested that Stanley Kubrick not use 217 for a room number (as specified in the book), fearing that nobody would want to stay in that room ever again. Kubrick changed the script to use the nonexistent room number 237.