My question involves real estate located in the State of: California
I bought a house last year in Valley Village, Ca. The fence bordering one side is covered in 30 year old vines that are knocking over a rotting termite infested wooden fence into my driveway. The neighbor on that side is a landlady to a multi-unit building she no longer lives in. I have had nothing but problems from her from the moment I moved in. Then, she had her manager build a white lattice fence (you can see each other through) on her property along part of the building and left the old posts and falling down fence with vines on my side without consulting me. Now, I want to remove the fence/vines and put in a redwood fence partway (from my garage to the back of our property) and wire mesh fence with ficus hedge growing through for the rest of the length of the property (so that we will both have privacy since her building is two stories looking onto my backyard.) I only have her brother's phone number (the manager of the property gave it to me) and he has said twice that she will call me, but she is refusing to do so. Also, her brother says that she says that she doesn't want the vines removed because of privacy. I only want her to pay for half of the redwood fence we will share, and half of the removal of the vines event hough she will benefit from the hedge. At this point, I can't even get her to call me. Meanwhile my workers are waiting to start the job. I have my quotes and went with the least expensive.
Cost: Vine removal- $2,500.00
Redwood- $930.00
Her half: $1482.50
What do I do, so that it's legal and fair? Also, since she moved out of the building, I have no address to serve her with papers, except a PO box I found online.

