Yeah the cross-section images in the article are very misleading, because they cut off the full width of the buildings on either side. A typical San Francisco l

Yeah the cross-section images in the article are very misleading, because they cut off the full width of the buildings on either side. A typical San Francisco lot is 100 feet deep, of which 2/3 or more is usually house and the rest is yard space in back. Put the actual full depth of the houses on either side of those images and it's much more obvious that you'd be just be creating tiny little houses in the middle of the street. They wouldnt contribute that much to the total amount of housing space and wouldnt have the property value of the surrounding larger houses with real backyards.