The construction of new ADUs has the potential to radically improve the civic realm of the city. Today, ADU legislation is being adopted by municipalities across the country. In those West Coast cities that first passed ADU codes, significant investment can already be seen in the building of thousands of new ADUs. Towns and cities with alleys have the opportunity to craft a simple, Alley Form-Based Code, based on principles of the most beloved minor streets. The code could then accompany new ADU legislation so as to set the stage for the transformation of the service alley into a minor street and bringing the “forgotten human scale'' to American cities for the first time.