dan haugh of pti securities. > > thank you. the move of st. louis construction firm clayco to its new headquarters in chicago over the next two years may boost the midwest's economy in more ways than one. construction has a history of bringing along manufacturing, professional and business services, wholesale and retail as well as transportation and finance. in our cover story, a look at the latest plum to land in the windy city. in moving to chicago from st. louis, clayco, a huge construction company on the cusp of expansion, gets a bigger airport with more flights for clients and employees, a bigger talent pool and more opportunity to partner with chicago's mayor, rahm emanuel, who's eager to recruit private enterprise for public infrastructure. "i want to emphasize absolutely that this is a growth strategy. there's no intention to lay anybody off. there aren't going to be layoffs in st. louis." clayco is a privately-held company. its annual revenue of $820 million comes from building some of the largest facilities for corporate giants. cate