Commentary for Bava Metzia 234:9
למעט בחלונות שומעין לו להרבות בחלונות אין שומעין לו להגביה אין שומעין לו למעט שומעין לו
R. Aha b. Adda said on 'Ulla's authority: If the owner of the lower storey wishes to alter [the building materials from hewn] to unhewn stones, he is permitted; [from unhewn stones] to hewn stones, he is forbidden;<span class="x" onmousemove="('comment',' [Unhewn stones are wider by one handbreadth then hewn stones, v. B.B. Mishnah 2a.] ');"><sup>9</sup></span>
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