Housing starts rose less than expected in May, likely reflecting labor and material constraints, but the overall trend remained consistent with strength in the housing market. _0"> Though permits for future home construction fell, that followed a surge in April, which hoisted them above the 1 million-unit mark. The pullback last month reflected a drop in the volatile multi-family sector, but permits for single-family construction touched their highest level in five years. The Commerce Department said on Tuesday housing starts rose 6.8 percent to a seasonally adjusted annual rate of 914,000 units. April's starts were revised up to show a 856,000-unit pace instead of the previously reported 853,000 units. Economists polled by Reuters had expected groundbreaking to rise to a 950,000-unit rate last month. Builders, who are ramping up construction to meet demand for housing against the backdrop very low inventory, have been complaining about labor shortages and increased