SDA is an industry leader in Civil Engineering consulting for Commercial Development, drawing on experience with high-profile, complex development projects for a range of clients and jurisdictions throughout the Puget Sound area.   We are nimble, dynamic and versatile, providing expertise to corporate campuses, highway design-build, retail complexes, plats, single-family residences and municipal projects.  SDA has a broad knowledge base, but our skills and creativity shine in stormwater and LID design which are increasingly critical to the success of any project.


This mall renovation and expansion project featured a new Nordstrom department store, a new 16-screen cinema, four new stand-alone restaurants, and a new urban village outdoor mall. Two multi-level parking garages and site modifications were completed to provide the required parking for the site. The existing storm water detention pond was modified to meet new requirements, and several mall entrances were improved to mitigate project traffic impacts. The project included site layout, grading, water and sewer design, and storm conveyance. Construction administration and construction support were provided for all of the site work.



This commercial project involved renovating a former Gai’s Bakery building located at the intersection of NE Union Hill Road and 178th Place NE in Redmond to a Gold’s Gym facility. Civil design included modifications to the existing parking lot, ADA improvements, street frontage improvements, and utility design. The loading dock areas were converted to sidewalk and landscape strip, and integrated into the existing parking lot. SDA also coordinated with the City on their design for the proposed improvements to NE Union Hill Road.