As the rebound in commercial building picks up, a key indicator of business conditions facing architects in the United States has hit its highest level in around seven years.

Published by the American Institute for Architects, the Architecture Billings Index (ABI) surged 2.5 points to go from 53.5 in June to 55.8 last month – well above the 50.0 mark separating increasing levels of billed design work from decreasing levels and higher than at any other level since 2007….