421 SW 6th Ave, Portland, OR 97204

Property Overview

Designed by renowned architect Pietro Belluschi and constructed between 1946 and 1948, Commonwealth is recognized as one of the first glass box, mid-century design towers ever built. Since its creative repositioning beginning in 2008, the building has become one of the dominant locations for Portland’s technology, advertising, media and information tenants.

More than $13.6 million was invested in tenant improvements, shared amenities and capital expenditures in recent years, allowing  Commonwealth to offer a best-in-class tenant experience. Amenities include a roof top deck, building conference room, tenant lounge, bicycle storage, a fitness center and locker rooms. The building fronts the Sixth Avenue transit mall providing tenants with convenient access to mass transit.

The property is among the oldest buildings in Portland to be awarded LEED-EB Gold by the U.S. Green Building Council.

421 SW 6th Ave, Portland, OR
219,742 square feet Total Rentable Area
Class A Building Class


  • 24/7 Security
  • Airport Nearby
  • Bike Storage
  • Conference Center
  • Dining / Shopping Nearby
  • Energy Management System
  • Entertainment Nearby
  • Fitness Center
  • Key Card Access
  • Locker Rooms with Showers
  • Lodging Nearby
  • Major University Nearby
  • Public Transportation Nearby
  • Rooftop View Terrace
  • Security Guards
  • Tenant Lounge
  • Transit Centers


  • energy-star
  • LEED Gold

*Logos shown represent awards or honors attributable to KBS properties in the last five years. LEED and Energy Star designations may reflect certifications received prior to the current year. Some properties may reflect multiple buildings where some of the buildings at the property do not possess LEED or Energy Star certifications. Awards shown may represent a specific event and do not constitute an endorsement of KBS by any of the entities shown.

KBS Higher Purpose Buildings

The KBS Higher Purpose Buildings (HPB) program combines concierge-level service with state-of-the-art buildings, a full range of amenities and unbeatable locations. The HPB program is intended to create a benchmark in the industry. Our buildings are not just a place to work, but a lifestyle experience, whether it be offering the latest fitness programs or healthy food options to outdoor space and the latest Wi-Fi technologies. We want to make sure the experience tenants have at each KBS property is the standard in the market.