I’m looking for a chapter book in which a father amazes his son by seeming to do a magic trick on a city block, involving a building which is either being built or torn down. The father doesn’t really do anything magical–he just has information that the son doesn’t, so he can frame it as something enchanted. The son totally believes the illusion and is in awe of his father. This episode, which extends over several weeks, is a plot point in a book that I don’t think was aimed at kids or YA but involved children. It was written, perhaps, in the 60s or 70s? I thought it was by William Goldman, but I haven’t been able to find it.