Nothing in this chapter shall prohibit a religious organization, association or society, or any nonprofit institution or organization operated, supervised or controlled by or in conjunction with a religious organization, association or society, from limiting the sale, rental or occupancy of real property which it owns or operates for other than a commercial purpose to persons of the same religion, or from giving preference to such persons, unless membership in such religion is restricted on account of race, color, national origin or ancestry. Nor shall anything in this chapter prohibit a nonprofit private club in fact not open to the public, which as an incident to its primary purpose or purposes provides lodgings which it owns or operates for other than a commercial purpose, from limiting the rental or occupancy of such lodgings to its members or from giving preference to its members. Nor shall anything in this act apply to rooms or units in buildings containing living quarters occupied or intended to be occupied by not more than four families living independently of each other, if the owner actually maintains and occupies one of such living quarters as his or her residence. (Prior code § 5-1304)