Not graffiti, but I think it qualifies as 'street art', albeit of a bygone era. And even in this state it is probably more easily readable than the graffiti!
But now we can venture to perhaps one of the most photographed buildings in Toronto - The Gooderham Building (also known as the Flatiron building) where on its 'flat' side is a mural installed in 1980 of a mirror image of the building across the street from it. This was also showing signs of wear and was fading and peeling and was recently meticulously repainted by one of the original painters of the project
Visit SundayStills for more street art