The foreclosure figures are based on the number of trustees deeds filed with county recorder offices. The document signals that a home was lost to foreclosure. The foreclosure totals can include units that the county assessor has designated as condos, but are currently used as apartments (e.g. a 100-unit complex designated as condos but used as apartments could be foreclosed on and those units would be reflected in the foreclosure total for that month). For this reason and others, the number of foreclosure filings has seesawed month-to-month over the past year, and a single month's increase or decline doesn't necessarily indicate the beginning of a lasting trend.