Every GTA city has a wealthy area. Vice City's (based on frames in Trailer 2) is on waterfront residential islands - the ones resembling Star Island / Hibiscus Island. The structures are modern, not period-styled.
For more on how this zone fits into Leonida's wider mansion zones, see the gated communities piece.
What the mansion frames show
Expansive modernist white-stucco homes featuring floor-to-ceiling glass. Swimming pools. Private docks. Yachts docked at the rear. Palm trees leading up driveways. Walls and security gates on the street side.
The properties look spacious, detached and costly - unlike the closely packed canal-side residences. The visual coding is exclusivity.
Where the mansion zones sit
Plural - likely more than one mansion district. Trailer frames suggest at least one Star Island-style waterfront island, and possibly inland gated communities elsewhere in the city. No specific named locations have been confirmed.
They are linked to the rest of the city via short causeways or single-road approaches - geographical constraints that make a chase leading into a mansion zone harder to escape from.
What mansion zones are likely to be used for
Speculative. Story-side: cartel homes, celebrity estates, target-rich neighbourhoods for heists. GTA Online-inspired: buyable homes (if a property system ships at launch). Photogenic / atmospheric: where people go to take screenshots.
Historical comparison: GTA V's Vinewood Hills served much the same purpose - see the Vinewood vs Vice City wealthy zones piece.