Section 6(4)(ix) in Allotment of Government Residences (General Pool in Delhi) Rules, 1963
(ix)Additional Secretaries/equivalent officers may further apply for change of accommodation in Central localities and the inter se seniority of such applicants shall be determined on the basis mentioned above (i.e., date of priority). Allotment shall be made on maturity of their turn, in order of their position in the waiting list and having regard to their preferences.