The question for me is why.
According to http://openbudget.seattle.gov/#!/year/default
2013: 4.32Billion
2014: 4.72Billion
2015: 5.14Billion
2016: 5:41Billion
2017: 5.71Billion
The city is having almost half a billion extra revenue every year in the past 4 years, and yet it feels compelled to increase taxes.
This has to be just a money grab.