The owners of this townhouse condominium wanted a luminous, light-infused home for their young family.  An open-riser stair was inserted into a glass-enclosed stairwell to distribute light from the skylit top level office, through the intermediate bedroom level, to the kitchen at the center of the ground floor.  Full-height glass partitions can be slid closed to seal off the kitchen and the cantilevered breakfast bar while meals are being prepared.