There's a new found sense of optimism for Calgary's retail sector, says a new report by Barclay Street Real Estate. In its mid-year report, the commercial real estate firm says the overall vacancy rate for the sector was three per cent in the second quarter of this year, which was down 0.4 per cent from the first quarter. This comes after four consecutive quarters of being in the mid-three per cent range and marks a return to first quarter 2016 levels.