Which of the following is NOT a requirement under the Fair Housing Act?

The Fair Housing Act prohibits discriminatory practices in various aspects of housing, including advertising. However, the question is asking for a choice that is not a requirement under the Act. Discrimination in advertisement of properties is indeed covered by the Fair Housing Act, as it mandates that advertisements cannot imply any preference, limitation, or discrimination based on race, color, religion, sex, national origin, familial status, or disability.

In contrast, the other options listed are essential requirements of the Fair Housing Act. The prohibition of discriminatory practices in housing sales ensures that individuals cannot be denied housing based on the protected classes defined in the Act. Equal treatment in housing services is another cornerstone of the Act, ensuring that all individuals have access to the same housing resources without prejudice. Lastly, protection for families with children directly addresses familial status, ensuring that families cannot be discriminated against based on the presence of children. Thus, since discrimination in advertising is indeed a requirement, it makes it the correct answer to the question.