Blacksmith,
That was my response, as well. Permission? From who? Why?
Well, as the story goes, there are layers upon layers of laws and regulations that start at the State, followed by County, township, city, and homeowners associations, or Property Owners Associations.
To have a tree removed, a person must file for a permit. The cost of the permit is 500 dollars. That money does not go toward the removal of the tree. The permit fee is used to pay the arborist who comes out to inspect the tree. If the tree is healthy and has no obvious defects, the arborist is not permitted to issue a removal order.
To get a around this, homeowners are taking steps that will kill the tree. Removing a dead tree is simple. Getting a permit to remove a dead tree is easy as pie. But, the homeowner is not permitted to physically harm the tree, such as by girdling it. The tree can be wrapped with cable and chains, then allow the tree to overgrow it, thereby killing itself.
The State of California is a true work of art. I've never been in such a hurry to leave a place.
Joel