About 6 months after we bought our house our neighbor put up a wall on the property line in the front yards of our homes. It extends from the pre-existing wall that already divided our property in our back yards. Basically, it was a really bright pink brick that he chose that clashes with our house. He didn't consult with us, he just built it. We decided that we would paint our side of the wall (the part that is right on the property line) white to better match our property. Before we did this we consulted the city and got an okay via phone. Our neighbor got angry and asked us to pay for half of the wall even though we didn't want it in the first place. Can our neighbor sue us for half of the expense. Can anyone verify that we are legal in our painting of the wall? Thanks for your advice.