7. The fourth set of conditions is—
(a)that the area suffers from high levels of crime;
(b)that the criminal activity affects those living in the properties referred to in article 3(1)(a), or other households and businesses in the area; and
(c)that making a designation will, when combined with other measures taken in the area by the local housing authority, other persons together with the local housing authority or by the police, contribute to a reduction in the levels of crime in the area, for the benefit of those living in the area.