Cornerstone Flooring Companies bought a North Baton Rouge office and warehouse building for $4.7 million and plans to move its headquarters there. The company closed on a deal Thursday morning to buy building at 2105 Oak Villa Blvd., said Alex Ruch with Elifin Realty. Ruch represented Cornerstone in the deal, while Branon Pesnell, formerly of Corporate Realty, and Bennett K. Davis represented the seller.