Reference for Bava Kamma 40:13

אתמר רב כהנא א"ר יוחנן אינו צריך להעלות לו שכר רבי אבהו אמר רבי יוחנן צריך להעלות לו שכר

there is no liability to pay? — That ruling is based on a different principle as the lower storey is by law accessory to the upper storey.<span class="x" onmousemove="('comment',' The occupation of the newly-built lower storey by the owner of the upper storey is thus under the given circumstances a matter of right. ');">¹⁰</span>

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