Watching through 'Along Came a Duke' earlier, I remembered that it was the episode which used the Warner Ranch as a filming location - see my earlier posts here. Sadly, all the famous buildings on the ranch e.g. the Bewitched house, the Lethal Weapon house, the Christmas Vacation house, the Friends fountain etc. were demolished a couple of years ago to make way for additional sound stages. I found this video which documents some of the other buildings on the ranch.
This longer video shows the buildings mid-demolition, and highlights the ones I mentioned above.