Unknown Origin 6

Normal sudoku rules apply. Numbers that are a chess KING's move apart cannot have the same digit. Numbers on arrows sum to the number in the pill at the arrow's origin. Numbers in cages sum to the number in the top left corner of the cage. SKYSCRAPER SUMS- Numbers in the grid represent a building of that height, at that location. Higher buildings block the view of all lower ones behind them. Numbers outside the grid are the SUM of all building HEIGHTS that can be seen, looking orthogonally into the grid, from that location.