Heavy equipment arrived at the Avenue Road building in the Yorkville neighbourhood on Saturday. Parts of the building, home to Spuntini Ristorante & Bar and Sotto Sotto, are expected to be taken apart to allow the investigators to examine the site.
However, an investigator with the Office of the Ontario Fire Marshal clarified that the building is not in the stage of being demolished.
"It's a systematic de-layering of the scene to make it safe for us to conduct the investigation," Peter Hamilton, an investigator with the office, told reporters on Saturday.
Hamilton also said that it's not yet known if the blaze should be considered suspicious, downplaying an earlier remark by Toronto fire officials.
The owners of both of the restaurants have said they hope to rebuild.