> but reinforced concrete is a poor choice for a long lifespan building due to its susceptibility to corrosion You can reinforce concrete with materials other

> but reinforced concrete is a poor choice for a long lifespan building due to its susceptibility to corrosion You can reinforce concrete with materials other than rebar. The theory behind reinforcement is a great idea, we shouldn't abandon it. If you don't reinforce it, it needs to be much much thicker and the ground needs to be much more resistant to uneven settling. The most durable construction is solid stone, period. Go to a quarry, quarry some gigantic boulders, carve them into giant walls and pillars. It will be very difficult to install but it's been done before by ancient peoples. It will be a very cold house, but it will last thousands of years. Some rich dudes in Egypt made some pretty big ones a while back, but I imagine we could make them more efficient today. Barring that, just pour the entire house out of a slow-cure concrete. The foundation doesn't actually have to last 1,000 years, it just needs to be modifiable with jackscrews into the main load-bearing members of the house.