Chicago architecture firm VOA Associates is in a deal to be acquired by a bigger Canadian firm. Edmonton, Alberta-based Stantec has a letter of intent to acquire the firm in a deal expected to close in late March, according to a statement this morning. Financial terms were not disclosed. VOA has 280 employees, with more than 140 in Chicago. Stantec has more than 15,000 employees, including a 50-person Chicago office.