Commentary for Avodah Zarah 41:8
בחוץ לארץ וכו': שדה דאית ביה תרתי גזרו בהו רבנן בתים דלית בהו תרתי לא גזרו בהו רבנן:
Outside of the land, houses may be sold and fields rented to them. A field, which has two problems, the rabbis decreed; but in the case of a house, since there is only one problem they did not decree.
Daf Shevui to Avodah Zarah
Once fully outside of Israel, the rules are even more lenient. One may sell them a house, because even in Israel there is only one potential problem with a house (giving them a foothold in the land). But one may only rent them a field because there are two potential problems (foothold and tithes).
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