What is the law regarding accepting Section 8 housing vouchers at a multifamily property in Illinois?

Is acceptance based on the discretion of the owner/landlord? Or is it required by law to at least say as a landlord "yes, we accept housing vouchers" knowing that the client will more than likely not be approved?
Update: To elaborate a bit, I guess my questions is - do I, as a landlord, have to say I accept Section 8 because of Fair Housing laws, knowing full well that because it is a high end property with a higher market rent, the client will be denied?
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