23.48.021

A. General 1. Development achieving extra floor area under Section 23.48.025 shall provide public amenities according to the standards of this Section 23.48.021 and Chapter 23.58A . If the development is not located within an adopted Local Infrastructure Project Area as per Map A for 23.58A.044, extra floor area shall be achieved through the requirements of subsection 23.48.021.B. If the development is located within an adopted Local Infrastructure Project Area, extra floor area shall be achieved through the requirements of subsection 23.48.021.C. 2. Development achieving extra floor area in Seattle Mixed zones shall meet the conditions of this Section 23.48.021 and provide public amenities according to the standards of this Section 23.48.021 and Chapter 23.58A , except where supplemented in the applicable subchapter. 3. Definitions in Section 23.58A.004 apply in this Section 23.48.021 unless otherwise specified. B. Calculation outside of specific areas 1. Means to achieve extra residential floor area. If the maximum height limit for residential use is 85 feet or lower or the lot is located outside of the South Lake Union Regional Center, SM-U zones, and the Mount Baker Station Area Overlay District, the applicant shall use bonus residential floor area for affordable housing pursuant to Section 23.58A.014 to achieve all extra residential floor area on the lot. 2. Means to achieve extra nonresidential floor area. If the maximum height limit for nonresidential use is 85 feet or lower or the lot is located outside of the South Lake Union Regional Center, SM-U zones, and the Mount Baker Station Area Overlay District, the applicant shall use bonus nonresidential floor area for affordable housing and child care pursuant to Section 23.58A.024 to achieve all extra nonresidential floor area on the lot. C. Calculation within an adopted Local Infrastructure Project Area 1. Means to achieve extra residential floor area. If the maximum height limit for residential use is 85 feet or lower, the applicant shall use bonus residential floor area for affordable housing pursuant to Section 23.58A.014 to achieve all extra residential floor area on the lot. If the maximum height limit for residential use is greater than 85 feet, the applicant shall: a. Achieve 60 percent of the extra residential floor area on the lot by using bonus residential floor area for affordable housing pursuant to Section 23.58A.014 ; and b. Achieve 40 percent of extra residential floor area by acquiring regional development credits pursuant to Section 23.58A.044 , except that a development that is located in the area bounded by Thomas Street to the north, Denny Way to the south, Terry Avenue N to the west, and Boren Avenue N to the east, on a lot that has slopes of ten percent or more, may achieve 20 percent of extra residential floor area by acquiring regional development credits pursuant to Section 23.58A.044 and 20 percent of extra residential floor area by providing public amenities consisting of a mid-block corridor, a hillclimb assist, and a public viewpoint that meet the following standards: 1) The mid-block corridor, hillclimb assist, and public viewpoint may be used to achieve extra residential floor area according to a ratio of 20 square feet of extra residential floor area per 1 square foot of qualifying mid-block corridor, hillclimb assist, and public viewpoint area. 2) The amenities shall meet the general eligibility conditions for amenity features in the Downtown Amenity Standards and the standards in subsections 23.58A.040.C.5.g, 23.58A.040.C.5.h, and 23.58A.040.C.5.i; provided that the mid-block corridor, hillclimb assist, and public viewpoint shall be considered open space amenity features for purposes of the general eligibility conditions for amenity features in the Downtown Amenity Standards. 3) The mid-block corridor shall: a) Be consistent with the size and coverage requirements, and the landscaping and lighting guidelines, for mid-block corridors in the Downtown Amenity Standards; b) Provide a continuous direct route connecting Terry Avenue N and Boren Avenue N; and c) Incorporate a mechanical conveyance, such as an elevator, for conveying pedestrians up the vertical distance between the elevations of Terry Avenue N and Boren Avenue N. 4) The hillclimb assist shall: a) Be consistent with the eligibility conditions for hillclimb assists in the Downtown Amenity Standards, except that an elevator may qualify as the required mechanical conveyance. b) Be consistent with the guideline requirements for hillclimb assists in the Downtown Amenity Standards except that at least 65 percent of the travel path must be open to the sky; and any covered portions of the corridor must have a minimum height of 13 feet between the ground and any overhead projection or overhanging structure. 5) The viewpoint shall provide public views of significant natural and human-made features, and shall meet the requirements for an additional open space area abutting the mid-block corridor specified in the Downtown Amenity Standards. 6) Only one lot may achieve 20 percent of extra residential floor area by providing public amenities consisting of a mid-block corridor and a public view point pursuant to this subsection 23.48.021.C.1.b. 2. Means to achieve extra non-residential floor area. If the maximum height limit for non-residential use is 100 feet or lower, the applicant shall use bonus non-residential floor area for affordable housing and child care pursuant to Section 23.58A.024 to achieve all extra non-residential floor area on the lot. If the maximum height limit for non-residential use is greater than 100 feet, the applicant shall: a. Achieve 75 percent of the extra non-residential floor area on the lot by using bonus non-residential floor area for affordable housing and child care pursuant to Section 23.58A.024 , or housing transferable development rights (TDR) pursuant to subsection 23.48.221.A and Section 23.58A.042 , or both; and b. Achieve 25 percent of extra non-residential floor area by acquiring regional development credits pursuant to Section 23.58A.044 . D. Minimum requirement. Developments containing any extra floor area shall meet the following requirements: 1. Green building performance. The applicant shall make a commitment that the proposed development will meet the green building standard and shall demonstrate compliance with that commitment, all in accordance with Chapter 23.58D . 2. Transportation Management Program (TMP). The applicant will provide a TMP for non-residential development, consistent with requirements for TMPs in any applicable Director's rule, that demonstrates, to the satisfaction of the Director in consultation with the Director of Transportation, that no more than 40 percent of trips to and from the development will be made using single-occupant vehicles (SOVs). The TMP shall be submitted with the Master Use Permit application. a. For purposes of measuring the percent of trips to and from the development made using SOVs in the TMP, the number of SOV trips shall be calculated for the p.m. peak hour in which an applicant expects the largest number of vehicle trips to be made by employees at the site (the p.m. peak hour of the generator). b. Compliance with this subsection 23.48.021.D.2 does not affect the responsibility of any employer to comply with Seattle's Commute Trip Reduction (CTR) Ordinance. (Ord. 127375 , § 49, 2025; Ord. 125791 , § 57, 2019; Ord. 125432 , § 9, 2017; Ord. 125267 , § 19, 2017; Ord. 125163 , § 8, 2016; Ord. 124883 , § 13, 2015.)