Bava Batra 148B

איבעיא להו: בית לאחד ודיוטא לאחד, מהו? מי הוי שיור, או לא? אם תמצא לומר בית לאחד ודיוטא לאחד לא הוי שיור, ״חוץ מדיוטא״, מהו?

A dilemma was raised before the rabbis with regard to the statement of R' Shimon ben Lakish: If one sold a house, i.e., a lower story, to one person and stated that the upper story will be sold to one other person, what is the halakha? Is this considered reserving additional rights for the second person apart from the upper story, or not? If you say that in a case where one sells his house to one and the upper story to one, his stipulation is not considered reserving rights for the second person, there is another dilemma. If one sold a house except for the upper story, reserving the upper story for himself, what is the halakha? Is this considered reserving additional rights for himself?

אמר רבא אמר רב נחמן: אם תמצא לומר בית לאחד ודיוטא לאחד לא הוי שיור, ״חוץ מדיוטא״ הוי שיור ⁠– ואליבא דרב זביד, דאמר: שאם רצה להוציא בה זיזין ⁠– מוציא;

Rava said that Rav Naḥman said: Even if you say that where one sells the house to one person and the upper story to one other person, he is not considered to be reserving rights for the second person, if one sold a house except for the upper story, he is considered to be reserving additional rights for himself. And this is in accordance with the opinion of Rav Zevid, who says that the reason the seller reserves additional rights is that if he wants to extend projections from the upper story into the space of the courtyard, he may extend them.

אלמא כיון דשייר דיוטא ⁠– מקום זיזין נמי שייר; הכא נמי, כיון דאמר ״חוץ מפירותיו״⁠ – מקום פירי שייר.

The Talmud concludes: Evidently, since he reserved the upper story, he also reserved the place of the projections. Here too, with regard to the one who gave a palm tree to another and reserved the fruit for himself, since he said that the tree is given to another except for its fruit, he reserved the place of the fruit for himself as well.