I had two main problems with my former neighbor: (1) water was trespassing because of defects in backyard sprinkle system and because he modified the grading where now excess water comes to my side and not the stree (2) he built a shade that encroches my side of the property and it is violating city building code. I found out on Thursday that the house was on sale and is on escrow so I immediately took a letter with pictures to the real estate broker. However, she dismissed my requests to fix these issues and was very rude. Her secretary signed a copy of the letter as proof that I delivered the letter with the information. I already reported the shade to the city on Friday. Now, what legal recourse do I have in regards to fixing the water issue? new owner is now responsible?