What rights does the owner of the door at the head/end of a shared alley have regarding the portion exclusively allocated to him according to the ruling that assigns the end section solely to him?

Primary text

If the ruling assigns the end portion of the alley exclusively to the owner of the door situated at the head of that alley, that owner has the right to modify his exclusive property. He may transform it into a private vestibule for himself or integrate it into his house, provided he does so in a manner that does not harm his neighbor and does not place anything upon the neighbor's wall, as this portion is his exclusive property.