Reference for Bava Batra 118:10

תנו רבנן מעשה באדם אחד שפתח חלוניו לחצר השותפין ובא לפני ר' ישמעאל בר רבי יוסי אמר לו החזקת בני החזקת ובא לפני רבי חייא אמר יגעת ופתחת יגע וסתום

<b><i>GEMARA</i></b>. [A MAN SHOULD NOT LET HIS WINDOWS OPEN etc.] Why only in a courtyard which he shares with others? Surely the prohibition should apply also to the courtyard of his neighbour? — The Mishnah takes an extreme case. On the courtyard of his neighbour he may certainly not let his windows open out.<span class="x" onmousemove="('comment',' Because he interferes with his neighbour's privacy. ');">⁹</span>

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