mr. donahue, the president of union iron works.nd what is particularly interesting about this building, among other things, is it's one of two buildings i know of that actually bears evidence of the 1906 earthquake. you can see in the cable a section of sheet metal that was patched in when the brick portion of the cable collapsed in '06. you actually see that on the other side of the building as well. there are like two buildings of foundry and a machine shop that were later linked during first world war. the shipyard, this is only part of a much larger shipyard that was undoubtedly one of the most important on the west coast, one of the earliest as well. they built prominent ships like the u.s. olympia and others. >> this is the potrero area, what we call the central waterfront (speaker not understood). just south of mission bay at 20th and illinois. >> and as we look, i find it fascinating that there are still remnants of 1906 earthquake, 100 years later in san francisco. another building that we can look at that shows that damag