Reference for Eruvin 177:4

מתני׳ <big><strong>כל</strong></big> גגות העיר רשות אחת ובלבד שלא יהא גג גבוה י' או נמוך י' דברי ר"מ וחכ"א כל אחד ואחד רשות בפני עצמו

R'SIMEON RULED: ROOFS, COURTYARDS AND KARPAFS<span class="x" onmousemove="('comment',' If the area of the last mentioned was not bigger than two beth se'ah.');">¹⁰</span> ARE<span class="x" onmousemove="('comment',' Since they are only irregularly and infrequently made use of.');">¹¹</span> EQUALLY REGARDED AS ONE DOMAIN<span class="x" onmousemove="('comment',' Even though the owners did not join in one 'erub.');">¹²</span>

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