Fink: there were already a set of doctrines previously established before the 1950's and there were Kingdom Halls built before that time too.
Of course there were disfellowshipping practices already in place - that is how the top dogs stayed top dogs. But, it was in 1952 that the rules expanded, changed, and enlarged to include all of the lowly congregants and became even more regulated from the top down.
"there were Kingdom Halls built before that time too." And? What of it? Are you conflating tax breaks with property builds? Tax breaks apply to more than just Kingdom Halls being built