Responsa for Bava Batra 45:3
<big><strong>מתני׳</strong></big> מרחיקין את השובך מן העיר חמשים אמה ולא יעשה אדם שובך בתוך שלו אלא אם כן יש לו חמשים אמה לכל רוח רבי יהודה אומר בית ארבעת כורין מלא שגר היונה ואם לקחו אפילו בית רובע הרי הוא בחזקתו:
<b><i>MISHNAH</i></b>. A PIGEON COTE MUST BE KEPT FIFTY CUBITS FROM A TOWN.<span class="x" onmousemove="('comment',' So that the pigeons should not eat the seeds of the vegetable gardens, or those spread on the roofs (Tosaf.). ');"><sup>4</sup></span> A MAN SHOULD NOT PUT UP A PIGEON COTE ON HIS OWN ESTATE UNLESS THERE IS A CLEAR SPACE OF FIFTY CUBITS ALL ROUND. R. JUDAH SAYS, THE SPACE SHOULD BE SUFFICIENT FOR THE SOWING OF FOUR <i>KOR</i>,<span class="x" onmousemove="('comment',' I.e. one Beth-Kor on each side. A Beth. Kor (space for the sowing of a kor) = 7500 square cubits. ');"><sup>5</sup></span>
Teshuvot Maharam
A. If A claims that the leaders of the community sold or gave to him the right to build the bath-house and if he has proof that they did not object to it for a while, after its construction and operation, he may continue to operate it, since the inconvenience is not so great, as it is being operated only once a week and the odor is mild.
SOURCES: Pr. 233.