Reference for Bava Kamma 40:15

נתנה לחבירו הוא מעל וחבירו לא מעל בנאה לתוך ביתו הרי זה לא מעל עד שידור תחתיה שוה פרוטה

Is not this ruling a proof that in a case where the defendant has derived benefit, though the plaintiff has [thereby] sustained no loss, there is full liability to pay? — That ruling is based on a different principle, since we have to reckon there with the blackening of the walls [in the case of newly built premises, the plaintiff thus sustaining an actual loss].

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