SAN FRANCISCO — The door is like many at AT&T Park — it's nondescript and it doesn't look like it goes anywhere special. Maybe it's a maintenance closet? There's a sign to the right of the door that doesn't make too much sense to the average person. It reads, "Suite B2 Electrical and IDF Rooms." In the middle of the door is a square with two crossed bats and "GC 1883." If you were walking on AT&T Park's suite level and didn't know better, you'd keep on walking.