Boston Canaletto

Zooming into the windows of Canaletto's Fonteghetto della Farina (one of two Canaletto's in Boston MFA), I see the clear prototype for countless American windows from the 1850s with double brackets below the ledge. I guess they don't call it "Italianette" for no reason. The painting is rich enough in its depiction of the port (immediately to the right), that you don't want to miss the asymmetrical balance of this facade. Make your choice: Athens or Venice? The Fonteghetto prefigures Giorgio de Chirico's metaphysical sensibilities.

I don't know enough about the actual building depicted. I am intrigued that another Canaletto Fonteghetto della Farina of five year earlier (in a private collection) is slightly different in the arrangement of the windows.