Hi, On the Sanborn Maps, the first step should be to check the Streets Index for each Volume to find the correct Map Sheet for your street. In this case, it was in Volume 1, and it looks like the even side of Commercial street is on Map Sheet 6. So, if you look at that sheet, unit 24 shows up at about half down down from Drumm towards East St. (now Embarcardero), on the north side. It was a two-story building with a Cooperage (wine barrels?). Perhaps they lived up-stairs? If you checked a City Directory, you can usually determine the cross-streets too. In this case, in the 1890 City Directory (http://www.sfgenealogy.com/php/1890.php), you can see that the even numbered units were on the North Side of the block, and 24 would be between East and Drumm streets. On a current map, you can see it is now probably part of 4 Embarcadero Center, near Justin Herman Plaza. How cool! Ron Filion sfgenealogy.com > Date: Sat, 26 Jul 2008 21:59:56 -0700 (PDT) > From: "A. Stefanik" <hattula1902@yahoo.com> > Subject: [CASANFRA] Feedback 24 Commercial > To: CASANFRA@rootsweb.com > > To: Listers, > > I am writing about map 1890 subject for San Francisco.? I need exact location where my great grandfather Antonio F. De Escobar and his family?s residence address at 24 Commercial.... > > Reference: http://www.sfgenealogy.com/sf/sanborn/sanborn.htm? > I studied at map at first.? I was not sure about what 24 means.? It > looks like a block number for that year of 1890. > It was disappearing > in late 1900?s because that street is not on some of old maps.? There > is no 24 on some of old maps, either.? I found Commercial St on sheet 14 which > is showing 21.? So, it means that 21 starts numbers in order like 22, > 23, 24.... Am I right?? I am little bit confused. > <snipped> > >