Is the division in property the middle of the pin or to the sides of the pin? The pin is about the size of a nickel & is embedded in the sidewalk.

Pine tree is beginning to lean, so one property owner has a greater interest in removing the tree than the other owner, but the tree is almost centered on the property line.

i know they have services where they jack up your home, and put supports and i believe concrete under it. i know it is costly but would anyone have any sort of range as to just how costly?
my property is lower than the road and every summer storm season (in florida) the property floods some, and comes very close to coming in my house. in the past before i owned it, it flooded significantly- unbeknownst to me when i purchased. my lot is lowest in the area, so all ground water sort of flows to me.