As gripes go, I admit it is a small one. But it’s sad to see windows appear in new buildings only to be covered over from the inside when a retailer with a basic corporate template for the floor plan moves in. You see this all over Washington, and in other cities too. I walk by these spaces and am always struck by the lost opportunity. You’re happy that there’s retail in the downtown, but then that same retail leaves whole blocks of dead windows facing the street. As an architect I interviewed for today’s Sunday column in the Post points out, there are solutions to this problem. But it takes a little pressure and guidance to get past the inertia.