a large old tree that is 90-95% on my property

the tree is damaged and rotted from the ground and up about 2ft. this is a very old and deemed unhealthy from several aborists. the tree is 90-95% on my property and because of its condition when it falls very likely would hit my garage and a great chance of hitting the bedroom attached. we approached the neighbor and made him aware of the tree's condition and i plan to have the tree removed along with other damaged trees on my property-he said he doesn't want it down unless we compensate him a percentage. is this legal in PA? - Is this your question? Add additional information