Yosef Karo, Translation:Shulchan Aruch — Orach Chaim 391…
“ Paragraph 1 - All of the laws of renouncing [ownership] for someone who forgot to make an eruv in a yard also apply in alley; if one yard forgot to make a partnership, it can renounce its ownership to the other residents of the alley, or they [can renounce] to it, even though they are money, because the members of a yard compared to the alley are likened to an individual in a yard. All of the laws of a Jew who lives in a yard with a non-Jew also apply in an alley or city ”
