Another tech company is making a home on Capitol Hill. California-based wireless speaker and audio technology company Sonos has announced it is opening an engineering office for 70 employees inside super green office building the Bullitt Center at 15th and E Madison.

Bullitt Center representatives said the new office makes the “greenest office building in the world” now 100% leased. Earlier this year, the center’s developers at the Bullitt Foundation celebrated the two-year-old project’s Living Building Certification. The Bullitt Center is the first office building to receive the certification awarded to buildings that essentially operate as living organisms — self-sufficient for water and energy and actively promoting the health of its occupants and surrounding environment.

UPDATE: A company spokesperson tells CHS that joining the Bullitt Center comes with added responsibilities. Tenants are expected to meet standards for energy consumption and be part of the building’s non-toxic material requirements. “We’re excited to be part of an environment that will encourage us to be thoughtful,” the Sonos representative said.

Sonos will begin with an engineering team of 10 in its new Seattle office with hopes to grow the teams working here to around 70. The engineering work done at the Bullitt will primarily focus on the company’s software, the spokesperson said.

The Sonos announcement comes amid a small wave of new tech firms finding new spaces in the neighborhood including the newly opened Chophouse Row development that Mazlo, Tectonic, and Glympse now call home.

“Our new and growing team in Seattle will take up residence at the iconic Bullitt Center, known as the greenest commercial building in the world, located in the Capitol Hill neighborhood,” the Sonos announcement on the new office reads. “We look forward to taking in the iconic ‘Seattle Sound,’ incredible music venues, the local Capitol Hill Block Party music festival, as well as the sounds of whatever the team has lined up in the Sonos queue.”

While the building has been a major success on the green construction front, it’s taken more than two years to fully lease the five-story center beyond the initial tenant roster. Like Sonos, not all tenants are environment-focused businesses or organizations but all tend to be forward looking and design focused. In 2013, for example, construction firm Hammer & Hand joined the building.

Here are the current Bullitt tenants Sonos is joining:

• Bullitt Foundation
• Hammer & Hand
• Intentional Futures
• International Living Future Institute
• PAE Consulting Engineers
• Point32
• University of Washington Integrated Design Lab

Space in the building was going for $30 per square foot. Sonos is claiming about 14,000 square feet, the company representative said.

With around 300 employees, Sonos also has offices in Santa Barbara, and Boston in the United States, The Netherlands, France, Germany, Denmark, The United Kingdom, and China. The company’s vice president of software development told the PSBJ Sonos will have room for about 70 employees in the Bullitt Center office. We’ll have to follow up to find out if the Bullitt Center will be able to deploy a full Sonos music system on every floor — and still meet its green benchmarks. UPDATE: Yup — Sonos will be deploying Sonos gear on their floor and a half of office space, we’re told.