Except outside America where it’s metric… also as someone who’s gone hunting for commercial space before, it’s kinda only 97% true that it’s always per year… there’s an irritating countercurrent of people that try and trick you into thinking something overpriced is a bargain by quoting the inflated prices at 1/12th the cost because that’s the monthly not the yearly, and people who just deliberately want to game various “by lowest price” sorting mechanisms on property listings websites.