Sales of newly built, single-family homes fell 14.5 percent to a seasonally adjusted annual rate of 384,000 units in March, according to data released today by the U.S. Department of Housing and Urban Development and the Census Bureau. "We keep hearing from our members that tight credit conditions are preventing many first-time buyers and younger families from being able to buy a home," said Kevin Kelly, chairman of the National Association of Home Builders. Most of the sales are coming from a smaller pool of buyers who have a more established credit history, are more likely to finance with higher down payments and are purchasing higher-priced homes. Regionally, sales in March fell 21.5 percent in the Midwest. Sales of existing homes were down less than a percentage point in March.