I'll go with Palo Alto, since that's what I'm most familiar with. It's still a city with >65,000 residents. You need tax revenue to support a city that large, along with all the services and maintenance that comes from supporting a 3-4x larger daytime (pre-COVID) population of people coming in to the city to work.
Prop 13 limits the % you can raise property tax each year, unless they sell the property (at which point the property tax resets to the sale value). That leads to a lot of people not moving and holding onto their old, low tax property.