Darling and Pearson was previously named Darling, Sproatt & Pearson, and its heyday began with Darling's commissions from the Canadian Bank of Commerce.
From 1893 through 1896 it evolved into Darling, Sproatt & Pearson, then finally Darling and Pearson was founded as such in 1897. Its heyday began with Darling's commissions from the Canadian Bank of Commerce in 1898, grand Edwardian buildings in Toronto, Winnipeg, Montreal, and Vancouver, and dozens of smaller branches in smaller Canadian cities and towns. 
