Did a slightly more detailed comparison between Mystery City and Salvador on Google Earth...
(A) matches up with a patch of green as the Praca Santo Antonio da Barra, and (B), where there is a distinct lack of skyscrapers, sits where a flyover intersection is in Salvador. (C) is a building parallel to the coastline sitting on a vegetated knoll, matching up with the one on Rua do Cristo. And (D), previously identified as Mansao Professor Pedro Calmon, matches up exactly with where it should be in Salvador, along Rua Sabino Silva.