The house faces the building, and there is a narrow vertical gap between the two buildings. Because it is shaped like a knife cut into two sides from mid-air, the building is split in two by a knife, so it is called heaven.
It depends on how wide the gap between the two buildings is and how far your home is from the two buildings.
Heaven is divided into true heaven and false heaven.
If the house in the above picture faces the roadway, it belongs to heaven.