Search TOBuilt and/or Architectural Index for Ontario, the Ontario Heritage Act Register (including the Ontario Heritage Trust - Places of Worship Inventory and the Directory of Federal Heritage Designations for basics on your building (e.g. name, address, architect(s), year built).
Search the Toronto Heritage Register using address or map (see Research Guide page)
Search the Toronto Bylaw Registry using the designation bylaw number (see Research Guide page)
Look for the intention to designate section including any supporting reports or documentation.
Search TMMIS for City Council or Toronto Preservation Board reports around the intention to designate or easement agreements on the building (see Research Guide page)
Search The Biographical Dictionary of Architects in Canada 1800 - 1950 for articles written at the time your building was built. (See Research Guide page)
Search the library website for books or articles that feature your building. (see Research Guide page)
Search Google Books, Internet Archives and Toronto Public Library
Search for Blueprints for your building (see Research Guide page).