Natty, I don't want to keep that tree!

As you can see, that tree is growing on the roof of the old house which I need to destroy.  If it were just a single trunk growing out of the ground then it wouldn't be so complicated.  The crown is huge but there is no single trunk to see, just a series of limbs that are as thick as trunks, and a labyrinth of roots creating a choke hold onto the old building.  Killing and removing that tree is difficult enough, but saving it is ridiculous.  You would have to save the parts of the building that it's clinging on to.  What would you do with that area?  Paint it and turn it into a work of art?  What if it were to collapse, and take out the new house with it?  Natty, I don't want to keep that tree!