Horton's Addition Block 89 HORTON'S ADDITION BLOCK 89.tif HORTON'S ADDITION BLOCK 89 Lot L- F,H. Robinson, classification of electro~lating shop as permissable M-1 Zone use at the SW corner of 4th and G Sts. Res. 87695 12-2-47 http://apps.sandiego.gov/directories/development-services/pdf/records/subdivision_cards/drawer_1/a_horton/hortons_addition_block_89.pdf