Predict the most populous city in the world in 2050 and in 2100

[austlar1]

Most new subdivision homes in the US, especially in the fast growing regions, are built by in very large numbers by developers as spec housing. Very few homes are built custom these days except in the wealthiest developments, and even there the home is usually built by a home-builder who offers a stock luxury product tweaked with custom features rather than a true architect designed original. The number of truly custom homes built in the US is really very small. I don't know much about the upscale Brazilian housing market, but I suspect that many or most of the homes there are architect designed and custom built.