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Stream Dexios: 4-Star South Lake Union Apartments

Posted on Jan 5, 2021 in:
  • Case Studies

Stream Dexios is a 5-story mixed-use apartment building by Stream Real Estate offering 80 units, from studios to two bedrooms to lofted one- and two-bedroom apartments with private rooftop decks.

Vital Stats



Location: Seattle
Star Level: 4-Star
Checklist: Multifamily Residential New Construction (v. 2017)
Verifier: Balderston Associates
Site and Water 127
Energy Efficiency 97
Health and Indoor Air Quality 130
Material Efficiency 71
  Total Score 444

In addition to living in the prime of the South Lake Union neighborhood, amenities include a rooftop deck complete with gardens and games, a fitness center, storage lockers, bike storage! Conveniently located to many Seattle neighborhoods, Stream Dexios is the perfect jump-off point for any adventure.

Stream Dexios Built Green 4-Star SLU apartment exterior

During this project, Stream Real Estate Development & Investment offset 1,010 tons of carbon by planting 202 trees in partnership with Forterra’s Evergreen Carbon Capture program, right here in Washington. Of the 131 tons of construction material generated from the project, 126 tons were diverted from the landfill! Virtually all of the roof deck is permeable pavers, planters, or green roof to mitigate stormwater runoff, provide gardening space for tenants, and reduce heat gain.

Shou sugi ban creates not only visual appeal, but also a long-lasting, low-maintenance siding with a low embodied-carbon footprint. Further lowering its carbon footprint is the 16.8kW solar photovoltaic system installed to offset energy consumption.

Stream Dexios Built Green 4-Star SLU apartment bike room
Stream Dexios Built Green 4-Star SLU apartment roof garden
Stream Dexios Built Green 4-Star SLU apartment living room

Built Green Highlights

Site and Water

  • Over 80% stormwater from roof and site managed on site
  • EnergyStar qualified roof to reduce urban heat island effect
  • Bio-planters on roof and over 1,600 sf raised garden beds for urban gardening
  • Located in urban, amenity rich South Lake Union with frequent transit service within two blocks
  • Commissioned irrigation system to maximize water usage as appropriate for plantings
  • WaterSense certified plumbing fixtures for reduce water usage

Energy Efficiency

  • 29% energy savings over the 2015 Washington State Energy Code
  • Programmable thermostats
  • High-efficiency heat pumps, above EnergyStar standards, in common areas
  • Exterior rigid insulation
  • 100% LED lighting and EnergyStar appliances
  • 300 W solar per 1,000 sf of space, for a total system of 16.8 kW
Stream Dexios Built Green 4-Star SLU apartment living room and kitchen
Stream Dexios Built Green 4-Star SLU apartment kitchen, hall, and desk space

Health and Indoor Air Quality

  • Low-toxicity jobsite operations
  • Low-VOC materials throughout
  • No carpeting in units
  • Extensive building envelope measures for superb moisture management
  • Radon-resistant construction using EPA standards

Materials Efficiency

  • Partnered with facility to send jobsite recyclables to a commingled recycling facility with rate of 90% diversion from landfill
  • Locally and regionally produced materials
  • ECOBATT insulation with over 65% recycled content
  • Durable siding: fiber cement panels, brick, and shou sugi ban
Stream Dexios Built Green 4-Star SLU apartment entrance patio
Stream Dexios Built Green 4-Star SLU apartment view from deck


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