With much of the ring-shaped main building completed at Apple's second campus and auxiliary buildings taking shape, construction progress from month-to-month is ramping up. Drone pilot Duncan Sinfield has captured new aerial video of Apple Campus 2, allowing us to get a look at changes that have been made to the campus since April.

Significant work has been done on the 100,000 square foot fitness center, where Apple employees will be able to work out and stay healthy. A stone facade is now in place and the building looks to be nearing completion.

There are new cranes in the area, which are being used to finish up some of the main structure. Additional solar panels have been lifted into place on the roof of the building, more windows have gone up, and more window canopies have been installed. Parking structures are also set to be completed in the next few months, and some work has been done on the Tantau research buildings.

According to Sinfield, the sizable green fence surrounding the entire campus is being taken down and replaced with a shorter fabric-covered chain-link fence. A thick white foam is being laid on the top of ground structures like the tunnels and the auditorium, presumably kicking off the landscaping process. Trees and other greenery may be put into place soon, with Apple planning to cover the campus with 80 percent green space.

Apple plans to finish construction on Apple Campus 2 at the end of 2016, with employees set to begin occupying the buildings at the beginning of 2017.