Section 60(2)(a) in The Delhi Development Authority Act, 1957
(a)every officer and other employees serving under the Delhi Improvement Trust or the Delhi Development (Provisional) Authority immediately before the date of the constitution of the Authority shall, on and from such date, be transferred to and become an officer or other employee of the Authority with such designations as the Authority may determine and shall hold office by the same tenure, at the same remuneration and on the same terms and conditions of service as he would have held the same if the Authority had not been constituted, and shall continue to do so unless and until such tenure, remuneration and terms and conditions are duly altered by the Authority: