Bonzalia is a city on a site that has been inhabited for many, many centuries. Since earliest times, it has been known for its metal work (copper and bronze specifically) and this shows in its architecture. Its love of tradition also shows.
The city wall is circular with nine gates oddly spaced around it, each road that exits it leads either to the mines in the nearby hills or to another city site (which are either a trading partner, ex-trade partner, or a port).
Though all the buildings are square or rectangular, the plastering rounds every corner. Stairs leading to buildings are all low and rounded, puddling around the raised doors (done so to avoid oh so pleasant large rodentia that inhabit this region). The building corners, both on top and bottom, have such stacked molding puddling around it (so it is stacked rounds of increasing size). The rounded edges are both decorative and give the rodentia less purchase to climb up on.
Towers, or two or three story stacks of smaller floors, are a common sight in the city. Bells are often installed in uppermost parts of these towers (both to beautify them, signify wealth of the house (as only the wealthy could commission a bronze bell), and to be rung to scare away evil spirits). The roofs in the city are normally thinly beaten copper (though some bronze is used) mounted to the actual roofing material. Given a variety of mixes and the frequency of roof polisher visits, the angular peaked ribbed roofs vary from shiny reddish copper/bronze to a full green copper patina. The roofline is a symphony of harmonious metallic colors mixed with similarly colored smokes.
Outside Doors (and many older inside ones) here are always rounded upon the top, creating an arch effect. This is a hold over from an earlier peoples who lived on this site.
Windows in the city always come in sets of three. They are narrow and rounded upon the top. They always rise slightly from left to right. This inspiration comes from the ancient arrow slits, the size of the old horn windows, and the lack of skill of the early local glass makers who could only make smaller pieces of window glass.
Any iron worked accessories of the city have a copper paint covering them.
All the woodwork in the city is of a local wood that becomes dark when stain/ sealant is applied. Copper or Bronze flakes are often added to the wood treatment to give it all an enhanced sheen and echo the metallic look which is so prevalent of the city