Housing (or rather, real estate) is an asset, a durable store of wealth.
Food and water are consumables.
Not durable, not wealth stores.
There's a great deal that hinges off real estate, especially in finance.
https://web.archive.org/web/20190115035057/https://plus.goog...
(And no, I'm not saying that high housing prices are good, but explaining the dynamic which drives them.)