What happens to retired Popes like Pope Benedict?

https://christianity.stackexchange.com/questions/14925/does-the-pope-get-paid-for-being-the-pope The above question is answered very well and shows that the Pope genuinely has no personal assets. He is well cared for by the Vatican. But what about the recently resigned Pope Benedict. He is no longer Pope and likely has very little or even no personal assets. What will happen to him? This is interesting to know because I think only two or three Popes have actually ever resigned. Most die in office. So there is no Papal retirement fund and I would think not really any official or traditional way of handling this.