city

Will they use sod or seed for the grass? Seems like they'll need a few football fields of sod or a dump truck of seed.

Other then in limited areas, grass that needs to be mowed is unlikely to be used on major commercial buildings in California because lawns require a lot of water. It's more likely that Apple will use "native grasses", if any. It's mow free and usually allowed to grow long. The trees will likely have drip irrigation and any grass would also have subsurface irrigation.