Scott, your article is a great start to working this out. The key would be to see a map of the original town lots, including the numbers, lot widths, and the original deeds of the Henry properties. This is what I did when researching Reading - the original lots were wider originally, 60-feet, in Reading then over time divided into halves, quarters. Unfortunately I don’t have any similar materials for Lancaster, but if you do we can figure out what was what.
My guess would be that in the early photo, the two adjacent structures at the corner are one original 60-foot lot in width, so both would be located on the first original town lot from the square. That assumes Lancaster’s lots were 60-feet like in Reading.