It is the policy of the City of Frederick to provide for fair housing to all of its residents, regardless of race, color, religion, sex, familial status, national origin, disability, marital status, or source of income; and to that end to prohibit discriminatory practices with respect to residential housing by any person or group of persons, in order that the peace, health, safety, prosperity, and general welfare of all the inhabitants of the City may be protected and insured.