Vince, Didn't check on the map, and not sure if any renumbering has occurred since the time period you have here, but know that the 200 block of North 2nd street, would be about 2 blocks North of Market or High Street, around Race Street, and 287 Callowhill runs parallel to Market or High a few blocks North of that street, at the 400 block North of that street, and the address would be between 2nd and 3rd street. I would say that they are in relatively close proximity. I am guessing a few blocks apart. The Ben Franklin Bridge today is right in that location. Dave