Existing-home sales, or completed residential real estate transactions for properties including single-family homes, townhouses, condos and co-ops, showed a renewed decline last month. February’s number of existing-home sales dropped 9.6% to 4.88 million when compared to 5.4 million in January.  Sales were down 2.8% year-over-year as well, from 5.02 million sales in February of 2010. […]