public void Build(BuildingStub[,] stubs)
    {
        buildingGrid = new Building[stubs.GetLength(0), stubs.GetLength(1)];

        int xStart = -stubs.GetLength(1) / 2;
        int yStart = stubs.GetLength(0) / 2;

        for (int y = 0; y < stubs.GetLength(0); ++y)
        {
            for (int x = 0; x < stubs.GetLength(1); ++x)
            {
                if (stubs [y, x] != null)
                {
                    var stub = stubs[y, x];
                    buildingGrid[y, x] = BuildingFactory.CreateFromStub(new BuildingStub(xStart + stub.xPos,
                                                                                         yStart - stub.yPos,
                                                                                         stub.type));
                }
            }
        }
    }