I'm loving all of these questions so much :sob:
The architecture is based on Ancient Egyptian, Hellenistic and sometimes Roman architecture with some Sornieth aspects thrown in, of course. It is a town in an oasis (I have already mentioned that) with all sorts of different types of architecture. Many houses are simple, smaller houses made out of hardened mud and bricks, with strong wooden internal framing. All of those types of houses have access to a flat roof which can be used for lounging, sleeping, decor or storage. Both the interior and exterior are purposely made to look rustic and ancient but in reality the interior is actually perfectly levelled and constructed within modern standards. It looks very rustic AND exotic at the same time.
Larger houses are built out of limestone, sandstone and granite with wooden components. There are several types of larger houses aka "villas". They can be completely built in a Hellenistic style which is fairly rare because almost all share some Egyptian elements at least. They can be a mixture between an Ancient Egyptian style and Hellenistic style, or they can be fully in an Egyptian style. Fully Hellenistic ones are mainly based on a simple exterior, walls made out of stone and bricks, supported by strong wood and some external roof parts supported by columns. Big terraces and balconies are a popular element as well, and every house has a peristyle. The interior is usually much more extravagant with colourful walls, beautiful and intricate motifs, granite or limestone floors, wall columns, stone stairs, finely framed ceilings, etc. Fully Hellenistic style houses have slanted roofs with terracotta roof tiles but most have accessible roofs with wooden fences and terrace roofing wood.
Egyptian style villas are built out of finely polished limestone and sandstone slabs, each has a flat, accessible roof mainly for lounging and parties. All of them are heavily decorated with beautiful and colourful floral, plant or animal motifs (mainly papyrus and water lilies), columns have colourful capitals and each villa has a big garden for many plants, shrubs and a rectangular pond with fish, lilies and waterfowl. The interior is just as colourful and decorated, with finely structured wooden ceilings.
Palaces and temples are the grandest types of architecture, all are accessible to all folk, temples are open all the time while palaces are populated mostly in the evening and during the night during lavish parties, but are still accessible whenever.
Temples are huge limestone structures with strong colourful columns and walls, limestone or granite floors (inside), usually with many columns consisting of grand statues, and sometimes walls were carved to present stunning wall carvings of people and other motifs.
Palaces are also huge stone buildings with huge granite columns, have less plant motifs but more motifs of people and culture. Walls are usually white with pretty colourful patterns but the colour scheme is usually white, red, black and gold. Floors are once again granite or stone with geometric patterns.
Both temples and palaces have enormous gardens; temple gardens are situated inside the building, palace gardens are outside the building.
There are also other public types of architecture like the library, coliseum, granaries, taverns or the hippodrome.