Stinson Leonard Street LLP, one of Minnesota’s largest law firms, will move to the Fifty South Sixth building next year.

The firm has been in the Fifth Street Towers complex, about two blocks from Fifty South Sixth, for nearly 30 years.

With the move, Stinson Leonard Street plans to design its new space to be more open and flexible.

“The stereotypes of mahogany paneling, shelves of law books and the ‘corner office’ layout no longer reflect how we work,” Mark Hinderks, managing partner for Stinson Leonard Street, said in a statement Thursday.

The firm will occupy 105,000 square feet, or three floors, of the 29-story Fifty South Sixth building. The building, owned by Hines, is also home to the Dorsey & Whitney law firm, Wells Capital Management and the local office of Deloitte.

With 185 lawyers, Stinson Leonard Street ranked as fourth largest in the state in the most recent survey by Minnesota Lawyer, an industry newspaper.

It is surpassed only by Faegre Baker Daniels with 281 lawyers, Dorsey & Whitney with 243 and Fredrikson & Byron with 227.

Stinson Leonard Street is being represented in the transaction by Anna Coskran and Russ Nelson of NTH, a Minneapolis real estate brokerage. Bob Pfefferle and Sargent Johnson, directors at Hines, and Nils Snyder of Colliers International represent Hines in the deal.