WASHINGTON — U.S. homebuilders broke ground on fewer apartment complexes in February, causing overall housing starts to fall 7 percent. The Commerce Department said Friday that housing starts last month were at a seasonally adjusted annual pace of 1.24 million, a decline that was anticipated after construction surged in January to 1.33 million. February’s slowdown in construction came from a 28 percent plunge in starts for multifamily buildings.