Translation:Shulchan Aruch/Orach Chaim/243

1 A person shouldn't rent out his bath house to a heathen because it is known to be his and this heathen does work with it on Shabbat; for the average bath house isn't rented out according to a percentage [meaning the worker takes a percentage of the profits of his employer], and they will say that all of the profit goes to the Jew and daily wages go to the heathen, and as a result the heathen is doing work as an agent of the Jew. But regarding a field, it is allowed, since it's common to rent out a field according to a percentage, and even though they know that it belongs to the Jew, they say the heathen is working according to a percentage ​and he's working for his own sake. And an oven is treated like a bath house. And a millstone is treated like a field. Gloss: And even if the heathen receives only a third or a fourth, and the Jew receives a benefit from the heathen's work on Shabbat, it's permissible, since the heathen is working for his own sake. [Beit Yosef in the name of Maimonides, Chapter 7; and Beit Yosef, Chapter 248, in the name of the Book of the Heave-Offering].

2 Even a bath house and an oven: if he rented them out year after year, and through this, the matter was publicized that the workers are not getting wages, rather they are rented, and similarly, if the custom of the place is that most people rent or stipulate that the profits go according to percentages, it's permissible to rent them out to a heathen or to have profits go according to percentages. Gloss: And even in a place where it is forbidden, if the bath house or the oven does not belong to the Jew, rather, he hired them from a heathen, and then rented them out to a heathen, it is permissible, since the property isn't recognized to be owned by the Jew [Or Zarua in the name of the Geonim]. And similarly, if there is a bath house in living quarters and the only ones that bathe in the bath house are those ​that live in the house, and they know that he hired a heathen, it is permissible [Beit Yosef in the name of Rabbi Isaac Aboab and Rabbi Chananel and Or Zarua]. And if one transgressed, and rented it out in a situation that is forbidden, some say that the rent money is permissible [Beit Yosef in the name of the Geonim], and some say that it's forbidden [Mordecai, first chapter of Shabbat; and so is the main view] [and see below, end of Chapter 245].