Many U.S. condo projects started during the real estate boom are coming to completion at a time that the condo market has softened.

Nationwide, the number of condos completed this year will be up 45 percent “” 232,933 vs. 160,239 “” from 2006, according to data tracked by Marcus & Millichap Real Estate Investment Services, a real estate investment brokerage.

But so far this year, condo sales have fallen 12 percent through August, Marcus & Millichap says. Trends in Las Vegas and Miami are worse, with sales off 46 percent and 29 percent respectively.