This is an example of a pre-1975 windfall at it's finest and the decades of legacy effects of Prop 13 [0]. Why would you ever want to sell your house if it costs almost nothing to keep empty/second home and you bought it before 1975?
If the Zillow data is correct, it looks like it's being taxed at a value of only $110k, ~60% of the original purchase price in 2017 dollars (from comment below). [1]