Stone is is ample supply all around Desmond’s nation, and that is amply evident in their building, which is wood-supplemented stone for the most part. The oldest buildings are often dry stacked stone, some of them just literally stacked, others carved cleverly and carefully to join perfectly while losing as little stone as possible.
In the Capital City, further from the mountains than many of the, stone and wood are used more equally: buildings are often wattle-and-daub over timber frames (think “Tudor” houses) wit tall stone foundations, often mortared together.
You can often tell the mage-wars-time buildings, because their stones are improbably large, their joins improbably tight, and their polishing improbably bright even after hundreds of years.
The Potentate’s Palace and the City Hall Building are from that time.
(Another feature of buildings from that time is an Escher-esque opinion about dimensions and architecture, even in houses now owned by the lower-middle or lower class. You might still wander into a poor person’s home and find that it improbably fits an extended family of twenty comfortably in a narrow building in a tiny lot that does not tower over its neighbors. Sometimes these buildings have views of other places, as well, out windows that should not show anything but the neighbors’ underwear: the mountains, the sea, even another nation. These houses are tightly-guarded secrets which nobody speaks of, often owned by the same family for centuries, by some deed from a long-dead Potentate.)