If anything they're generic enough for Dwarves, Humans and Gilneans (Unless you push for Gilnean architecture (Which we lack more of in-game) as it's own) while Gnomes would generally be more mechanical, Night Elves would have more a more natural look and Draenei would have their own look. Compare that to the Horde where the Trolls and Orcs would generally have a similar theme, sort of like Dwarves to Humans, and Goblins would use a variant of that or use their own style of buildings from Kezan.
That said, you could push for complete individuality for every race, but you might struggle with Human/Dwarf and Orc/Troll, as there isn't much unique architecture for the second in each.