I had a 100 plus foot tree in my back yard that needed to come down as it was not only covering my yard, but the neighbors on both sides, as well.
After several estimates from companies that seemed less than enthusiastic about climbing a tree that tall, the people at Top Tree Service gave a reasonable estimate and seemed to be challenged by the height of the tree.
They spoke with my neighbors to make sure they had permission to enter their yards if necessary and made sure any necessary permits were obtained.
They used a cherry picker to get the higher branches and then ropes and a pulley like system for the rest of the branches.
The tree took 2 days to come completely down, but it was amazing to watch them work so quickly.
They cleaned up all debris from the yards and disposed of it.
I highly recommend them if you need any kind of tree removal or trimming done.