An institution that had a valid approval to operate on June 30, 2007, issued by the former Bureau for Private Postsecondary and Vocational Education pursuant to former Chapter 7 (commencing with Section 94700) of Part 59 of Division 10 of Title 3 of the Education Code, as it read on June 30, 2007, shall maintain that approval under this chapter. For the purposes of this chapter, the approval to operate shall be valid for three calendar years after the expiration date of the approval, as it read on June 30, 2007.