It shall be unlawful and an unlawful real estate practice for any lending institution to refuse to negotiate for, enter into or perform any agreement to lend or guarantee the loan of funds, or in making, agreeing to make, arranging or negotiating any loan or guarantee of funds, for the purpose of financing the purchase or sale, construction, lease, rehabilitation, improvement, renovation or repair of any real property, or to offer or agree to terms, conditions or privileges that discriminate between persons because of race, color, religion or national origin of any party to such agreement, or of any member of the family of any such party, or of the residents of the area in which such real property is located.