@Zagorath Your comment on the other post made me look in further depth… I haven’t really found much on the north/south divide yet, which supports your thoughts there, but I did find this report on the boundary streets so thought I’d add it here: https://nit.com.au/01-01-2025/15602/the-boundary-streets-of-brisbane-a-history-of-division
(Though the report does seem to mention several Southside places and I think only Spring Hill on the Northside?)