Quote from : The Disneyland Book of Secrets 2014 - DCA: One Local's Unauthorized, Rapturous and Indispensable Guide to the Happiest Place on Earth Book

Walt also had a humorous sign posted outside the mansion, recruiting ghosts who wanted to enjoy 'active retirement' in the "country club atmosphere' of this 'fashionable address'. Interested ghosts were to write to the 'Ghost Relations Dept. Disneyland,' and were told,'Do not apply in person.