Alley setback is defined as the required minimum distance from an alley right-of-way to any building as shown in Figure 12.64.211 Alley Setback. The alley setback area must be landscaped according to the principles set forth in BMC 12.64.300 Street, Surface Water Management and Open Space Regulations. The minimum required setback dimension shall be as specified in BMC 12.64.100 District Requirements.