פירוש על עבודה זרה 42:4

A Jew is allowed to rent, at least outside of Israel, a field to a non-Jew, even though non-Jews will certainly work there on Shabbat. Why are we not concerned lest people think that non-Jews are working for Jews on Shabbat? The answer is that people will think that he is a tenant—someone working for a share of the crops. It is permitted to have such an arrangement.
But then why not say the same thing about the bath-house—people will think that the non-Jew has a tenant relationship with the Jew, and works the bath-house for a share of the profits? The answer is that such business relationships are not typical for bath-houses.