In spite of the difficult economy, the major downtown Austin condo projects continue to move toward completion. Lots of news updates this week:- Tomorrow, Spring will celebrate its topping off. The 42-story building on 3rd and Bowie just east of Lamar has reached the top and is on track for completion in July. The 246 unit tower will be the first project delivered in 2009. According to the developers, an impressive 55% of units have already been pre-sold. With units starting around $300k, Spring is the . . .