Is it legal for an owner of a 20-unit apartment building to refuse to rent to women?

The correct answer is that it is illegal for the owner of a 20-unit apartment building to refuse to rent to women. This is rooted in the Fair Housing Act, which prohibits discrimination in housing based on sex, among other protected classes.

Under federal law, it is unlawful to deny housing to individuals based purely on their gender. This applies universally, regardless of the number of units in the building. The intention behind such legislation is to prevent discrimination and ensure equal access to housing for everyone, regardless of their sex.

In situations like this, exceptions or varying interpretations based on location, tenant history, or other criteria do not apply to the fundamental rights provided by the Fair Housing Act. Therefore, any policy or action that involves discrimination based on gender, such as refusing to rent to women, is clearly against the law.