Apple's main offices are in Cupertino.
As this is the Apple Headquarters, in good lighting you should see landmarks such as the giant dot-matrix figures at Infinite Loop. In the dark, all the building parking lots are marked with modern Apple Logos on a low white sign with black print.
Exit on Mathilda, turn south, drive a bunch, watch Mathilda merge with Sunnyvale-Saratoga Rd, drive south some more, changes names to De Anza somewhere around the 280 fwy. [continue on 280 directions.]
If you miss Mathilda (when coming south) or prefer to stay on highways for a maximum time, you can take Lawrence Expressway south, and exit on Stevens Creek, heading west into the setting sun. You'll pass the mall near Wolfe; keep going. De Anza is a huge street with a light, turn right. Just past Lazaneo (a light, there's a Donut Wheel to your right), turn right into the driveway with a low white sign showing a blue apple. The first opportunity you have to turn left will be marked Infinite Loop. Take this left, and follow the loop until you get to Building 4. Park.
Exit on De Anza Blvd, turn south. It will not be very far; there is a light at Mariami and you should turn left there. The first opportunity you have to turn left will be marked Infinite Loop. Take this left, and follow the loop until you get to Building 4. Park.
If you miss Mariani (and if it's really wet, you might) this is a divided highway... you will have to U-turn at the next light, Lazaneo. (You'd see a Donut Wheel shop to the left.)
Exit turning north. You are going to be driving a little while. Do not distress and wonder where Apple is as street numbers approach the 10500 range - this is "S. De Anza" and you have to cross Stevens Creek before you're in the right section.
Once past Stevens Creek, keep an eye out for the light marked Lazaneo (with its donut shop). Past it there will be low white signs with blue apples on your right. If you miss the little driveways, you can turn right at Mariani, which is rather large, and a light. The first opportunity you have to turn left will be marked Infinite Loop. Take this left, and follow the loop until you get to Building 4. Park.
For those familiar with the campus: we ARE in Garage 1 Room. We are NO LONGER in Town Hall or the similar but smaller auditorium at De Anza building 3. Mariani is the large street which leads from De Anza into the Infinite Loop.
Garage 1 is upstairs in Apple Building 4, and access is through the main lobby of Building 4. Buildings 3 and 4 are the ones closest to Highway 280, and aligned roughly parallel to it. There is plentiful parking in the back.
The Apple Logo on this lot is colored blue.