19.42.130 Setback types and measurements.
The form and intensity standards tables in this chapter provide minimum standards for street, interior side, and rear setbacks. Clarification on how these setbacks are measured are provided below.
A. Measurement. All setbacks must be measured at right angles, or as near to right angles as possible, to the nearest property line in a plane horizontal to the ground. Setback directions must be determined as provided in subsections (B) through (E) below.
B. Street Setbacks.
1. The street setback is measured from the street right-of-way to a line parallel to and measured perpendicularly from the street right-of-way at the depth prescribed for each zone.
2. For corner lots in residential zones, the street setback is measured from the street right-of-way that is the property’s street address and primary access. The other lot frontage is referred to as the side street setback.
3. Street setbacks for garages apply to the front doors of individual private garages and do not apply to underground or aboveground parking structures shared by multiple residents or tenants.
C. Interior Side Setback. The interior side setback is measured from the side lot line adjacent to another property or alley right-of-way to a line parallel to and measured perpendicularly from the side lot lines at the depth prescribed for each zone.
Exception: No interior side setback is required between individual units within a townhouse building, where allowed.
D. Interior Side Setback—Upper Floors. The interior side setback for the portion of the building above the floor level of the second floor is measured as provided in subsection C of this section, except the measurement is to the portion of the structure above the floor level of the second floor. The additional second-floor setback must not apply where the interior side lot line is along an alley.
E. Rear Setback. The rear setback is measured from the rear lot line to a line parallel to and measured perpendicularly from the rear lot line at the depth prescribed for each zone.
F. Setbacks for Flag Lots. Flag lots are exempt from street setback requirements. Flag lots must have a rear lot line designated, typically opposite from the access corridor (the pole of the flag), and all other lot lines are considered side lot lines (see Figure 19.42.130(F)).
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G. Setbacks for Lots Served by Shared Driveways. See AMC 19.54.040(E) for applicable standards.
H. Through Lots. For lots featuring streets on opposite ends, the street setback is measured from the street right-of-way that is the property’s street address and primary access. The opposite lot frontage is considered the rear setback.
I. Setback Measurements for Irregular Lots. Setback distances established for residential zones are based on rectangular lots. Nonrectangular lots, lots with three sides or more than four sides, curved property lines, and other nonstandard lots require special measurement techniques in order to achieve the purpose of setback requirements:
1. Rear Setbacks. In the case of an irregularly shaped lot, a 10-foot line which is within the lot and parallel to and most distant from the front lot line must be considered the rear lot line for purposes of determining required setbacks and for interpretation of other provisions of this code (see illustration).
2. Interior Side Setbacks. All lot lines which are not front or rear lot lines must be considered interior side lot lines for the purpose of measuring setbacks.
3. Determination by Director. Where a building site is situated such that it is unclear which should be considered the front, rear, and sides, required setbacks must be as determined by the Director in compliance with the following criterion: required setbacks must not permit the placement of buildings on the site in a manner that will constitute a grant of special privileges inconsistent with the limitations placed on other properties in the vicinity and incompatible with surrounding uses.
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(Ord. 3040 § 2 (Att. A), 2019)