The assessed value on District commercial property declined more than 10 percent from a year ago, according to the Office of Tax and Revenue, but the multiyear slide in overall D.C. assessments appears to be easing.

OTR is mailing 2011 assessment notices to 190,000 city property owners. Roughly 170,000 owners also should expect tax bills in the mail for the 2010 first half of the tax year. Payment is due by March 31.