Here in AZ, we typically use a shared block wall on the property line to separate our yards.
A back yard neighbor has a huge tree that's about 4-5 feet from the corner of their yard...yes, a very poor choice of location. The tree is easily over 25ft tall...probably even more. I have grass in my back yard, so naturally the tree's roots have taken hold in my yard. I have actually seen shoots coming up from that tree over 60 feet away from its base...I kill them like all my other weeds.
At first, the only problem was grass edging blocks getting pushed up and obvious high spots in the grass where the now very large roots are pushing up the the grass...
I can live with all of that, but the common wall is now cracking and separating between the courses and has actually lifted the post cap about an inch! I share that section of wall with the "tree" neighbor about 6 feet and a third neighbor about 8 feet...pic at cid-15527a90e6c89289.photos.live.com/embedphoto.aspx/Wall/DSCN1837a.jpg...put the http in front.
Any advice on how to handle all of this? The wall will obviously need to be repaired or replaced, but how can I stop the tree from doing it again or worse, maybe infiltrating under the house slab.