Usually contractors buy this kind of broken house, fix it and resale it. The cost for them to fix the broken house is much cheaper than regular buyer who calls workers to fix it. Material is cheap ! only labour cost is high.

4S ranch is not land filled and belongs to Ralphs family http://www.signonsandiego.com/news/reports/4sranch/

The methane gas from the ground is everywhere, if you sleep on the groud everyday, you will have problem too.