City planner is making a scale model of his city for his office building. The model has a coordinate grid where each unit is 1 meter. On the grid, the tallest building is located at (3, 1), the city park is located at (3, 4), and the public library is located at (4, 4). The planner intends to convert the triangular space between the three buildings into apartments. What is the area of this space on the model? square meters (is not a pair)