Who should I talk to when the property confirms the demolition of the wall?

Who designed this for you? Tear down this wall to make an open kitchen. Don't you see that the bathroom is designed? Haven't you ever thought about going to the bathroom upstairs and cooking or eating downstairs? Moreover, China's cooking habits are not suitable for open kitchens, because there is a lot of oil smoke, and many customers regret doing open kitchens. Hygiene is not easy to manage.

If you want to tear down the wall, you should go to the property to get the original structural drawing of the house and see if this wall is a load-bearing wall. If it is a load-bearing wall, it doesn't matter if your house is demolished on the top floor, as long as the property agrees, if it is not a load-bearing wall, the property agrees to demolish it. this is not important