What is the answer to the crossword clue „Iconic observational tower of Seattle which which was the tallest building west of the Mississippi River at the time it was built: 2 wds.“. We have found 1 Answers for: „Iconic observational tower of Seattle which which was the tallest building west of the Mississippi River at the time it was built: 2 wds.“. Try to find some letters, so you can find your solution more easily.