Union Iron Works, located in San Francisco, California, on the southeast waterfront, was a central business within the large industrial zone of Potrero Point, for four decades at the end of the nineteenth and beginning of the twentieth centuries.

https://en.wikipedia.org/wiki/Union_Iron_Works

Union Iron Works Office

Little Sweet

Machine Shop

Powerhouse #1

Pier 70 in San Francisco, California, is a historic pier in San Francisco's Potrero Point neighborhood, home to the Union Iron Works and later to Bethlehem Shipbuilding. It was one of the largest industrial sites in San Francisco during the two World Wars. Today, it is among the best-preserved 19th century industrial complexes west of the Mississippi.

https://en.wikipedia.org/wiki/Pier_70%2C_San_Francisco