OAC’s design and construction professionals are experienced in managing projects built by and for the community.


In public projects, there are many moving pieces and stakeholders. OAC understands the nuances and knows how to work with all parties to build consensus and mitigate risks.

By asking the right questions, measuring the right data, identifying risks, and beginning with the end goal in mind, we have helped communities and governments achieve success for over 65 years. From conceptual scope and budget development, alternative project delivery evaluation, design and pre-construction management, all the way through quality validation, punch review, closeout, and warranty, we are the building partner that can manage it all.


OAC is passionate about working on projects that serve our community. Courthouses, city halls, fire and police stations, libraries, operations centers, parking garages, and community centers—our goal is to assist our public partners to deliver projects that meet current and long-term community needs. Our in-house staff capability is extensive, and we deeply value and nurture our MWBE partnerships.


Our team of aviation design and construction management professionals is well versed in complex projects with challenging existing conditions, finite schedules and tight budgets that are required to maintain 24/7/365 mission-critical operations.

We collaborate with a wide range of airport stakeholders to deliver operational, administrative, and passenger areas, as well as comprehensive vertical transportation upgrades. Our unique approach fosters a collaborative project environment based on open communication and trust.


OAC specializes in transit where horizontal meets vertical including bus, commuter rail, and light rail projects. From maintenance and operations facilities to electric vehicle conversion, our diverse and extensive project delivery expertise can help reduce the overall project timeline, gain stakeholder consensus, and promote a more efficient and effectively delivered project.

Project Delivery

OAC specializes in alternative project delivery, including Progressive Design-Build, GC/CM (CM/CG, CMAR), and Design Forward CM. We collaborate with our public partners to select the delivery method that best suits their unique circumstances. OAC has successfully performed more alternative delivery projects under RCW 39.10 than any other entity.

Adaptive Solutions

We understand the importance of fitting within your team structure and will provide adaptive solutions that work. Our ability to bring innovative technology through our Advanced Project Controls promotes clear and transparent data that enables efficient and effective decision-making.


As an employee-owned organization, OAC cares about people. Our Government & Transportation team is driven by a passion to deliver projects serving the people in our communities more successfully.


Our teams seamlessly integrate with public agency clients to make better happen together.

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