Yosef Karo

“ Paragraph 20 - If there is a yard in which Jews and non-Jews live, there are windows between one Jew's house and another Jew's house, and they made an eruv through the windows, even though they are permitted to move things from house to house through the windows, they are still forbidden to move things from house to house through the openings, because of the non-Jew, until they rent from him. ”

“ Paragraph 15 - If a Jew and a non-Jew live in one house, [another member of the yard] must rent from the non-Jew and make an eruv with the Jew. Rem"a: This assumes that they each have independent living quarters. It is also the case if (two Jews) live in a similar arrangement in one house that [another member of the yard] must rent (from both of them) (Beit Yosef in the name of Hagahot Oshr"i) . ”

“ Paragraph 6 - As long as the non-Jew has not reneged, the renting works, even for a long time. He cannot renege on his renting until he returns the money (Beit Yosef in the name of Rash"i chapter HaDar) .
סעיף ו - כל זמן שאין האינו יהודי חוזר בו מועיל השכירות, ואפלו לזמן מרבה. ואינו יכול לחזר משכירתו עד שיחזיר הדמים (בית יוסף בשם רש"י פרק הדר) .
Paragraph 7 - If one rented from a non-Jew for a specified time period, once this time period is finished he must rent again, and he must make a new eruv, as the first eruv does not come back to life. ”