[1] In 1860, Theodore H. Spencer, LL.B., began his practice and opened the firm's first office at 20 Toronto Street, site of the Masonic Temple, built in 1858 by William Kaufman.

[2] WeirFoulds is deeply rooted in Canadian history, stretching back to when Toronto became the industrial center of Ontario in the late 1800s.

[3] The firm is currently located in the Toronto-Dominion Bank Tower, at 66 Wellington Street West, in Toronto, Ontario.

[6] The firm's corporate practice represented the T. Eaton Company in 1920 to develop what was then the largest department store in Canada, beginning a long relationship with the company that lead the firm, in 1965, to act on its behalf to assemble the land for the Eaton Centre in Toronto, the largest urban redevelopment project in Canada at the time.

[citation needed] From 1974 until the late-1980s, WeirFoulds was retained by the Ontario Hockey Association to handle legal matters and court cases.