The FAA controls airspace from ground level up. There have been a couple of legal cases concerning airspace over private property but, as Kabeyun pointed out, that's not settled law yet.
Currently, Hobbyist drone pilots can legally fly over Apple Campus all day long as long as there isn't a temporary flight restriction in place at the time and as long as the Hobbyist drone pilot NOTIFIES the airport operator and airport tower (if one exists) BEFORE flying. Notice I said notifies. A Hobbyist drone pilot does not need permission to fly in Class C airspace. Class C is NOT a no-fly zone. A Hobbyist drone pilot only needs to notify the operator and tower of his presence and time of flight.
Anyone interested in such matters should start with the FAA's FAQ page first:
https://www.faa.gov/uas/faqs/
Hobbyist drone pilots fall under the Special Rule (known as Section 336). There is a very specific set of conditions that a Hobbyist drone pilot must meet and follow to be considered a Hobbyist. Those conditions were established by Congress. Read the actual law here:
https://www.faa.gov/uas/media/Sec_331_336_UAS.pdf
Scroll down to Sec 336 - Special Rule for Model Aircraft which states (in part):
(a) IN GENERAL.—Notwithstanding any other provision of law relating to the incorporation of unmanned aircraft systems into Federal Aviation Administration plans and policies, including this subtitle, the Administrator of the Federal Aviation Administration may not promulgate any rule or regulation regarding a model aircraft, or an aircraft being developed as a model aircraft, if—
(1) the aircraft is flown strictly for hobby or recreational use;
Sec 336 then provides the conditions. You'll notice that NOWHERE does it state that a Hobbyist drone pilot must ask permission. Rather, the Hobbyist drone pilot must NOTIFY when operating within 5 miles of an airport.
Apple's ONLY hope to eliminate drone flights over its property is to convince the FAA to make the area a no-fly zone. That seems highly unlikely.
Currently, a Hobbyist drone pilot can operate their drone over any private property as long as the property isn't in a no-fly zone AND proper notification has been given to any airport within 5 miles AND the drone operator isn't invading someone's reasonable expectation of privacy. Meaning, not hovering low over the property and pointing the camera into windows, etc.
The days of having an absolute expectation of privacy in your fenced backyard are over. It's up to the courts to determine what a "reasonable" expectation of privacy entails. But it's up to Congress to make it law. With regard to Hobbyist drone pilots, Congress is the only body that can change it. Congress has already told the FAA that it can't make rules to regulate Hobbyist drone pilots. It's the law.
Mark