Sioux Falls has a long history as a pioneering city, and our CNA Building office space is ideal for forward-thinking businesses. The office space is based in a LEED-certified, environmentally friendly building, right at the heart of downtown Sioux Falls. It's a place that's modern and contemporary, but remarkably well integrated with the surrounding environment. So while large windows look great from the street and let natural light fill the indoor space, they also offer outstanding views of the Big Sioux River just outside. On-site and in the surrounding area, numerous useful amenities make it easy to find everything you need - all in walking distance. So whether you're heading outside to our quiet patios or exploring a dynamic community of service-based businesses around the city, it's all conveniently accessible. And, thanks to fast connections to I-90 and I-29, it's also a great home for your business with access across South Dakota and beyond.