I posted about 10 months ago the statements of a realtor, that even then, the illegals were literally propping up the entry level home owner market. Several posters replied and dismissed this as pap and questioned my realtor friend's professional status.
I quess it wasn't really so far fetched. I believe that one can contact Jess Katz on KNEW radio as he too has been expounding on this for months.
For confirmation of illegals buying housing, look at archives of Michelle Malkin articles. I believe that there are govt guarantees involved also.