Responsa for Bava Batra 12:12

תניא כוותיה דרב חסדא שתי חצרות זו למעלה מזו לא יאמר העליון הריני בונה מכנגדי ועולה אלא מסייע מלמטה ובונה ואם היתה חצרו למעלה מגגו של חבירו אינו זקוק לו

'Ulla and R. Hisda, however, say that the owner of the higher one has to assist<span class="x" onmousemove="('comment',' I.e., by contributing to the cost. ');">¹⁷</span> the owner of the lower in building from his level. It has been taught in agreement with R. Hisda: If there are two adjoining courtyards of which one is higher than the other, the owner of the higher one must not say to the other, I will start building [the party wall] from my level, but he must assist the other to build from his level.<span class="x" onmousemove="('comment',' I.e., by contributing to the cost. ');">¹⁷</span>

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