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HomeMy WebLinkAboutPN_Longacres_Master_Plan_Project_Narrative_250131_v1Longacres Campus Master Plan – Project Narrative page 1 Longacres Campus Masterplan #1: Project Narrative Longacres Park has been an important place in the history of the Puget Sound region for the better part of the Century. Unico’s vision for the site is to continue and build upon that legacy with an innovative and forward-looking Master Plan. No site in the region has the potential to have such a diverse and innovative mix of uses, bringing together entertainment, professional athletics, high tech commercial, and substantial residential development. The site provides an opportunity to create a unique, vibrant mixed-use development in Renton. The master plan builds upon the existing +/- 330,000 sf of existing commercial space on the site by adding approximately 3,000 new residential units, approximately 1,400,000 sf of future commercial and medical office, approximately 230,000 sf industrial, approximately 100,000 sf of retail, food and beverage, 2 hotel sites (150-200 keys), and an 8,000 person music venue. The plan proposes to demo the existing building on parcel 7 for a future music venue. The plan proposes to build approximately 6,500 parking stalls to support the site uses. In addition, the Seattle Sounders FC (under separate permit) have completed their Seattle Sounders FC Performance Center at Longacres that houses the soccer training, team development and office operations for Seattle Sounders FC. In addition to this program mix, Longacres includes substantial natural resources that can serve as major amenities to tenants and visitors. These natural resources provide habitat and connectivity for animals as well as outdoor places for people. The site is also situated along the Sounders line and is adjacent to current and future bus-rapid transit lines, making it poised to take advantage of the region’s many transit and multi-modal transportation options. These mixes of uses and possibilities make Longacres a totally unique opportunity, potentially setting a new bar for mixed-use development in the Puget Sound Region and beyond. a. Project name, size and location of site: The project name is the Longacres Campus Masterplan. The project location is proposed for the Longacres Office Park (LOP) in Renton, Washington. Within the LOP, the “Site” is comprised of lots 3, 4, 6, 7, 8, 9, 10,11,12,13, 14, 15, 16, 17, 18, 19, 20, and 21, Tract 1 and 2 of City of Renton LLA No. LUA23-000366, King County Recording No. 20240322000285, City of Renton, King County, WA. The address of the site is 1901 Oakesdale Avenue SW. The Site includes one existing office building. Building 25-20 (approximately 311,982 gsf) located at 1901 Oakesdale. The Site includes maintenance building 25-02 (approximately 25,416 gsf) located at 1302 SW 16th St. and building 25-03 (approximately 9,945 gsf) located at 1300 Southwest 16th St. The Project Site overall is approximately 120 acres. b. Zoning designation of the site and adjacent properties: The majority of the lots at the Site are zoned Commercial Office (CO). Lots 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, and 18, Tract 1 and Tract 2 are zoned Commercial Office (CO). Longacres Campus Master Plan – Project Narrative page 2 Lots 19, 20 and 21 are zoned Industrial (IM). The Comprehensive Plan land use designation for the Site is Employment Area (“EA”). The property along the West Site Border is the BNSF ROW. The property along the Northern edge of the Site is the I-405 ROW. To the South the adjacent parcels are zoned Commercial Office (CO) and to the East the adjacent parcels are zoned Commercial Office (CO) and Industrial (IM and IL). c. Current use of the site and any existing improvements. The Site includes an existing 5-story, 311,982 gsf office building (building 25-20) at Longacres Office Park and an existing 21,889 gsf daycare (building 25-10). Boeing previously used the buildings and site for commercial airplane services. The buildings were used for office space and housed Boeing employees engaged in commercial airplane design and operation. The site also includes a number of undeveloped parcels and surface parking lots. d. Special site features (i.e. wetlands, water bodies, steep slopes. The Site includes the following features: high seismic hazard areas, wetlands, special flood hazard areas. Seismic: GeoEngineers have provided Preliminary Geotechnical Engineering Services and a report dated September 26, 2024 for the site. See attached RS_Geotechnical_Report_240131_v1. Wetlands: The Site includes a few wetlands. Pace Engineers has prepared a Critical Areas Report January 31, 2025 that describes the site features in the area. See attached RS_Critical_Areas_Report_250131_1. Steep Slopes: The Site does not include steep slopes, but a large portion of the site is in a Special Flood Hazard Area. e. Statement addressing soil type and drainage conditions The general subsurface conditions consist of relatively shallow fill overlying alluvium. The Fill generally consists of very soft to stiff silt with varying amounts of sand, gravel and organic matter and loose to medium dense sand with varying amounts of silt, gravel and organic matter. Fill thickness varies across the site and is up to approximately 6 feet thick. Alluvium was encountered near the existing ground surface or beneath the fill. The alluvium generally consists of very soft to medium stiff silt with varying amounts of sand and organic matter and very loose to medium dense sand with varying amounts of silt, gravel and organic matter in the upper approximately 20 to 25 feet. Thin layers of peat and organic silt were observed at various locations across the Longacres Campus within this upper portion of alluvial soils. Beneath this upper generally fine-grained layer of alluvium, the unit transitions to denser coarse-grained deposits consisting mostly of sand. These deeper coarse-grained deposits generally consist of medium dense to dense sand with varying amounts of silt and gravel. Occasional layers of gravel were observed within the deeper alluvial soils. Some of the sand and gravel layers are very dense. Although not encountered in many explorations, occasional large woody debris such as logs exist within the alluvial soils, and rubble or other debris may be encountered in the fill from previous grading and development activities. Longacres Campus Master Plan – Project Narrative page 3 The ground water levels in the vicinity of the site are expected to fluctuate seasonally and be near the ground surface during the wet season. f. Proposed use of the property and scope of the proposed development (i.e., height, square footage, lot coverage, parking, access, etc.): See attached Site Plan addressing the proposed use of the site and scope of development. See P_Civil_Plans_250131_v1 and P_Floor_Plans_and_Architectural_Elevations_250131_v1. g. Proposed off-site improvements (i.e. installation of sidewalks, fire hydrants, sewer main, etc.): Not currently applicable as roads currently part of the site. See P_Civil_Plans_250131_v1 and P_Floor_Plans_and_Architectural_Elevations_250131_v1. Additional Information to follow. h. Total estimated construction cost and estimated fair market value of the proposed project. Not applicable at this stage of work for the concept master plan. Additional information to follow. i. Estimated quantities and type of materials involved if any fill or excavation is proposed. See attached Civil Drawings for estimated quantities and type of materials involved in any fill or excavation. See P_Civil_Plans_250131_v1. j. Number, type and size of trees to be removed. See attached Arborist Report by Salish Restoration Associates for number, type and size of trees to be removed. RS_Arborist_Report_250131_v1. k. Explanation for any land to be dedicated to the City. Not applicable at this stage of work. Additional information to follow. l. For shoreline applications only - Type of Shoreline: Parcel 2423049022 is adjacent to Springbrook Creek to the East and has a section of regulated Shoreline, BRSC-B Black River/Springbrook Creek Reaches. The shoreline is for the Springbrook Creek. m. The proposed number, size, and density of new lots… No New Lots are proposed. See See P_Civil_Plans_250131_v1 and P_Floor_Plans_and_Architectural_Elevations_250131_v1.