It is an interesting point, how property taxes affect architecture. I wonder how much work has been done on this point. The Flatland example of narrow houses due to street-front taxes is one example, overhanging medieval and renaissance buildings due to plot taxes is another. A more modern example is the Greek example of the "unfinished" and "unroofed" house to avoid paying taxes, which are only levied on finished houses.
I would think that a modern approach should involve property taxes based on energy-efficiency. However, that may be a topic for another time ... taxes will keep, along with death. A slightly related documentary might be interesting, however. The topic: how many people can live on Earth? Something that seems important to the heavily compacted (so they say) Flatlanders.