(iv) Be adequate in size with respect to the number of rooms and area of living space needed to accommodate the displaced person. The number of persons occupying each habitable room used for sleeping purposes shall not exceed that permitted by local housing codes or, in the absence of local codes, the policies of the displacing Agency. In addition, the displacing Agency shall follow the requirements for separate bedrooms for children of the opposite gender included in local housing codes or in the absence of local codes, the policies of such Agencies;