What happens to homes during a depression

So if the country was to completely collapse, and massive numbers of home owners default, who buys the homes? The banks can't foreclose because no one can buy them, or even if some entities did, the homes would fall into disrepair and decay, making them worthless when the market swings back.

We are not talking about a 1000 foreclosures a day like the great depression, we are talking 100's of thousands a day if it happens today. I don't think the system can handle that. I also don't think that it would be enforceable either. If homes are foreclosed on, then the owner is kicked out, so who then watches or repairs or upkeeps the house? With about 80 million homes, if even only 30% foreclose, thats 24 million homes. There is no way to keep people out, or keep that many homes from decaying. And thats not even considering the fact that in a depression, money becomes frozen. Only people who HAVE money will be able to buy the homes, and probably wouldn't because of the current financial issue increasing the risk, plus the realization of decay.

I really don't see how a depression can work this time around, at least regarding houses. It almost seems like there would just need to be a pay-what-you-can type system in that scenario. Obviously a lot of auditing would take place, which in itself would create jobs, but not nearly enough.

Im probably missing something obvious, but i have been thinking about it a bit since the stock market went into the shitter, and nothing pops out to me.