Since 2004, an average of three houses a day are torn down, many of them original homes built for the middle working class in the 1920s, '30s, and '40s. Very few are deemed significant enough to merit heritage protection, but they are part of the heritage of the city. Their demolition is not only architectural loss. When these old home come down, a whole history goes with them -- the materials that were used to build them, the gardens, the successive owners and their secrets.