The City of Cupertino Resolution No. 13-084 gives the company a Development Permit to allow the demolition of approximately 2.66 million square feet of existing office, research and development buildings and the construction of 3.42 million square feet of office, research, and development buildings; 120,000 square feet (1,000 seat) corporate auditorium, 100,000 square feet corporate fitness center, and 25,000 square feet Valet Parking Reception uses; 92,000 square feet of utility plants; and associated parking facilities and ancillary buildings (such as security reception areas and landscape maintenance buildings).
Street level photographs of the demolition can be seen here. To learn more about the new campus take a look at the video here.
It's expected that Apple Campus 2 will be finished in 2016.