jabs: I vaguely remember ours, from the early '70s, when Gord Rayner's huge jazzy mural went up at the foot of University Avenue. There's a photo of it in Building with Wood by John I. Rempel ( the chapter on Ontario's polygonal buildings ) from the final years when it was an Avis Rent-A-Car place. It was about six storeys tall.
Octagonal houses were all the rage in the mid-19th century apparently ( well, I don't need to tell you that ... ); there was a three storey one built in Leaside in 1854 that burned down in 1915. Then there were the octagonal deadhouses, unique to Ontario churchyards, where bodies were stored in the winter until the ground thawed in the spring and they could be buried. There was a handsome brick mock-Goth one on the grounds of St. Michael's cemetery that was slated to be demolished in the late '60s. The one in Necropolis was taken down in 1910.