Back in the day, one of the things that made a city great was its access to waterways to transport people and goods. the city is situated on a peninsula and borders the Pacific Ocean and the San Francisco Bay. Rows of piers were built along the waterfront to accommodate the comings and goings of ships who would onload/offload whatever they had.
They heyday of these buildings have long passed and almost all of the shipping has been moved to the east bay where the practice still thrives