The American Institute of Architects (AIA), Washington, D.C., says billings at architecture firms remained steady in December, ending the year with the highest number reported since July. According to the AIA, “Firms with a commercial/industrial specialization continue to report the strongest business conditions, with billings climbing to the second highest score…of all time. Billings growth continued at a moderate pace for firms with an institutional specialization, and firms with a residential practice reported the fifth month in a row of declining billings.”