A boutique apartment building in the heart of Capitol Hill
Stream 403 is a 47-apartment Built Green 4-Star boutique residence on the corner of Belmont and Harrison — one of the quietest streets in Capitol Hill, Seattle. Eight thoughtful floor plans across studios, open one-bedrooms, and one-bedrooms, each designed for the way Capitol Hill actually lives: coffee on the corner, Light Rail two blocks away, the rooftop for everything in between. Live it up.
Stream 403 is a Built Green boutique residence at the corner of Belmont and Harrison in Capitol Hill. Offering studios, open one-bedroom layouts, and one-bedroom apartments, the community is designed for modern city living with convenient access to nearby cafés, transit, and neighborhood amenities. Enjoy thoughtfully planned spaces, rooftop access, and a location that keeps Capitol Hill within easy reach.
Stream 403 · Capitol Hill · Built Green
Four reasons to
live at Stream 403
- 01
Live It Up
A rooftop terrace gives residents a place to enjoy open-air views, fresh air, and everyday moments above Capitol Hill. With space for lounging, gathering, and relaxing, it adds another layer of comfort to life at Stream 403.
- 02
Intentionally Designed
Stream 403 offers studios, open one-bedroom layouts, and one-bedroom apartments with practical features for modern city living. Each floor plan is designed to make smart use of space, comfort, and everyday convenience.
- 03
The Neighborhood
Located near Belmont and Harrison, Stream 403 places residents close to Capitol Hill cafés, shops, parks, dining, and transit options. From daily essentials to weekend plans, the neighborhood keeps city living within easy reach.
- 04
Ecologically Sound
Stream 403 is a Built Green 4-Star certified apartment community designed with sustainability in mind. Energy-conscious features, efficient systems, and thoughtful building practices help support a more responsible way to live.
A connected Capitol Hill address
two blocks from Light Rail
403 Belmont Ave E is located at the corner of Belmont and Harrison, placing Stream 403 close to Capitol Hill Light Rail, Broadway, Pike/Pine, nearby parks, cafés, grocery options, and everyday neighborhood conveniences. With transit, dining, and local destinations within easy reach, the community offers a practical Capitol Hill location for modern city living.
Living in the heart of the city doesn’t get much better than this. The perfect distance from Broadway, Pike/Pine, downtown — and convenient access to I-5 brings you right here to this quiet corner on Belmont and Harrison.
From the leasing office
About the location
Sometimes living in the city means having to eat out once in a while — that is a pretty convenient situation to be in around here. The neighborhood is rich with coffee shops, restaurants, and historic Capitol Hill character.
About the neighborhood
Capitol Hill
Building sustainable structures that not only serve our residents but also complement our environment is our goal. We are proud to be Built Green.
About sustainability
Built Green
Apartment amenities at Stream 403
Every Stream 403 apartment includes smart key-fob entry, in-unit laundry, full-size appliances, and access to the rooftop terrace, on-site fitness center, secure package lockers, and bike storage. Cats and dogs welcome.
Rooftop Terrace
Park On Top
Communal BBQ · skyline views
Fitness Center
24/7 Fitness Center
Cardio, free weights, and training essentials, just downstairs
Views
Skyline Views
Select residences look out over downtown Seattle, Puget Sound, and the Cascades
Package Lockers
Parcel Pending
Parcel Pending system, secure 24/7 access for every delivery
Flex Storage
Bike & Storage Lockers
Dero bike lockers and dedicated storage for every resident who needs it
Smart Homes
Keyless Entry
Smart key-fob locks on every unit and every common door
Pet policy
Pet-Friendly
Cats and dogs welcome (2 max). 50/mo rent per pet
Sustainability
Built Green 4-Star
Certified sustainable construction. 1,800+ trees planted in Western Washington
Studio and one-bedroom apartments
in Capitol Hill
Choose from eight floor plans — efficient studios, open one-bedrooms with a partial wall, and full one-bedroom apartments with a separate bedroom. Studios start at $1,875/mo. One-bedrooms include corner units with skyline views.
What residents say about
living at Stream 403
Frequently asked questions
about Stream 403
Is Stream 403 pet-friendly?
Yes. Stream 403 welcomes cats and dogs — up to two pets per apartment. The pet policy is a 50/month pet rent. There are no breed restrictions specific to the building.
How close is Stream 403 to Capitol Hill Light Rail?
Capitol Hill Light Rail Station is approximately two blocks from Stream 403, an easy 5-minute walk. The Link Light Rail provides direct service to downtown Seattle, the University District, and SeaTac Airport without a transfer.
What does "Built Green 4-Star" mean for residents?
Built Green 4-Star is a regional sustainable-building certification administered by the Master Builders Association of King and Snohomish Counties. For Stream 403 residents, it means better insulation (lower heating and cooling bills), healthier indoor air, water-efficient fixtures, and construction practices that planted 1,800+ trees in Western Washington. Stream 403 is one of a small number of Capitol Hill apartment buildings certified at the 4-Star level.
Is Stream 403 a quiet building?
Yes. Stream 403 sits on the corner of Belmont and Harrison — a residential side street one block off Broadway, well away from Capitol Hill’s nightlife corridor. Residents consistently mention the building’s quiet on Google reviews, and the construction quality (Built Green 4-Star) includes upgraded insulation that reduces between-unit sound transfer.
What floor plans are available at Stream 403?
Stream 403 has eight floor plans across three categories: studios (Unit A, A2), open one-bedrooms with a partial bedroom wall (Unit C, C2), and full one-bedroom apartments with a separate bedroom (Unit B, D, D2, E). Total of 56 apartments across eight floors. View the floor plans page for layouts and current availability.
A rooftop park, on top of your apartment
The rooftop terrace at Stream 403 is the way Capitol Hill actually unwinds — sunsets over Puget Sound, summer BBQs with friends, and a quiet morning coffee with the Space Needle in the distance. A community park on top of your home, open year-round.
Come see it. Tours daily.
Pick a time, tell us which floor plan interests you, and we’ll walk you through the building, the rooftop, and the fitness center. We reply within one business day.
Leasing Office
- 403 Belmont Ave E Seattle, WA 98102
- (206) 325-5899
- info@stream403.com
Hours
- Tuesday - Saturday: 9:00 am - 6:00 PM