The online tool for Dementia Enabling Environments has a section on dementia friendly public buildings. It’s an interactive design tool. So clicking on a room in the floor plan brings up a 3D view of the room. Hovering the mouse over question marks in the room brings up more detailed information about design ideas that are good for people with dementia. Of course, these designs are usable for almost anyone else who is ambulatory, including people with other cognitive conditions.
This is an excellent resource that takes accessibility beyond the access codes which don’t cover this level of design. The Dementia Enabling Environments tool also covers homes, care settings, and gardens and nature. There are links to other resources as well.
This website has lots of other information about dementia design. You can use the search facility on the menu, or to get you going here is a link to other resources.