The coffin home concept gets exported from China to the rest of the world for the poorest in our communities. This becomes a common use for repurposed office space that no longer needed as work-from-home technology is far superior at that point. The richest see loads of personal automation and AI assistance in their daily lives. Most single family homes have solar or wind generation capability. Suburban sprawl expands much farther out as well. Water is the most precious resource by then, so most households have personal water treatment and recycling.