If you are looking at a high quality building for your business that supports large free- spans and has incredible durability; steel frame construction might be the answer you are looking for. Structural Buildings is a general contractor out of Becker, MN with Branch offices in Mankato, MN, Brainerd, MN, and Frederic Wisconsin. Any of our offices will be able to work with you for all of your commercial building needs and ensure that you get a high quality building that you will be proud of. .