Double Skin Facades

The reference guide for this credit (v 2009) mentions that "The line of sight can pass through 2 interior glazing surfaces." Our building has a double skin facade with two glass layers that are about 2 meters apart. The space between the two layers isn't fully conditioned and it isn't regularly occupied, although it serves as emergency egress with egress stairs and emergency exit doors at ground level. Do both layers of the double skin facade count as exterior glazing? Or is the inner layer an "interior glazing surface?" Thank you! Raina