2. Which direction is your neighbor's house, on the left? Right? Before? After that?
3. The neighbor's building just does not violate the relevant provisions of the civil law, such as lighting, ventilation, drainage, etc. Therefore, you can't interfere, and you can't interfere with your feeling of feng shui.
Building a house in a neighbor's house has only three aspects to your feng shui. First, there is no impact. Second, it ruined your feng shui. Third, it is good for your feng shui. It depends on the specific situation. It's not a bad thing to influence Feng Shui.