Online real estate-related spending will surge to an estimated $1.8 bln in 2005, a 55% increase from 2004 $1.16 bln, according to Borrell Associates. Total ad spending on real estate will increase to just $11.3 bln in 2005, from $11.2 bln in 2004. Online share of real estate ads will grow to 15.9% in 2005, from 10.3% in 2004.