Architectural Billings Index: August ABI national overall score of 40.0 remained flat from July’s 40.0, which is under the expansionary zone, (>50). U.S. architecture firms specializing in commercial and industrial facilities likewise reported a decrease in design activity in August, coming on the heels of a significant upturn in July. Firms concentrating in the multifamily, either residential or institutional sector, reported modest gains in August.