Max and Francine were married for 20 years before Francine died. Max and Francine lived in Kansas, a common law state. Francine left all of her assets to Max when she died. Max and Francine jointly owned their residence which they had purchased for $200,000 twelve years ago. Over the years they spent $80,000 remodeling the home. When Francine died, the house was valued at $600,000. What is Max's basis in the house following Francine's death?