1 Overcast corner means that there is no building in the external environment of the missing corner.
The missing corner refers to the missing corner, which is the neighbor’s house, that is to say, there is a building.
Your patio belongs to the outside of your home, but it is inside the entire building, so it belongs to the sun.
2 The missing corners upstairs and downstairs are in the same direction, so just fill them up downstairs.
3 Your home is missing the northwest and northeast corners. The south terrace is not a missing corner.