I have a theory about the "Chicken Building" referenced on the 11-19-59 blueprints discussed in another thread here. I suspect that this is an original reference, unrelated to the later Don Knotts film, but I also suspect that the set in question is the Bates Motel and not the Psycho House. Consider that the "Revamp of Chicken Bldg. and Fence" reference accompanies the blueprints for "Ext. Bates Motel and Home" (not merely the house set).
Here is a correlation that may have relevance. This first photo is a cropping of a photo circa 1923 of the buildings on the backlot that were part of the chicken ranch on the property. Note the portion of the building in the foreground here (not the larger one in the b.g.):
The second photo is a cropping of a 1951 photo, zeroing in on what Marc Wanamaker identified as a caretaker bungalow:
Notice the similarity in the features of these two structures...particularly the chimney placement, and also the protruding roofline on the back side. Not only that, but both buildings are oriented identically (south side facing the camera in each photo), and both appear to be in relatively the same location on the lot based on geographic features in the larger photos.
The other aspect of this is that the "bungalow" from the second photo, which was located southeast of the courthouse facade, is gone by 1963...replaced by the easternmost portion of the To Kill A Mockingbird street.
Perhaps it is a leap, but is this structure perhaps the "Chicken Building," named because it dates to the original chicken ranch on the backlot, and were components of this structure perhaps used in the construction of the Bates Motel?
Are there any ground level views of this structure out there?