You want to head south on De Anza. You will go through about 4 stop lights before you get to Stevens Creek Blvd. Portal is on the left side of the road so you will need to go one block past Stevens Creek Blvd. Go through about 7 lights. Portal is on the right side.
Parking is under the building.
You will see a drive just next to the building and just as you drive by the back of the building, you will see a smaller drive that will take you to the underground parking. Then take the elevator up to the lobby.