Horton's Addition Block 63 HORTON'S ADDITION BLOCK 63.tif HORTON'S ADDITION BLOCK 63 Lots J-L- Permit to Balboa Bldg. Co. to alter offices at 854 4th Ave. into a hotel with no side yd, no rea yd & 100,, coverage. Res. 320 6-24-43 http://apps.sandiego.gov/directories/development-services/pdf/records/subdivision_cards/drawer_1/a_horton/hortons_addition_block_63.pdf