The country’s first same-sex marriage license was issued at the Boulder County Courthouse, earning it status as a National Historic Landmark. Credit: Wally GobetzThe country’s first same-sex marriage license was issued at the Boulder County Courthouse, earning it status as a National Historic Landmark. A property tax increase would cost $48 per $100,000 in home value annually, or $296 per $685,00, the average home price in the city. Of the 788 registered voters who responded to the poll, 57% said they would approve a property tax and 58% would approve a sales tax. Boulder County CommissionersOn Friday, May 30, commissioners will:Join representatives from Rocky Mountain Equity and Downtown Boulder Partnership for the designation of the Boulder County Courthouse (1325 Pearl St., Boulder) as a National Historic Landmark.