Walt, the 4th window from the left is visible behind the lamppost's globe. The obelisk is only wide enough to block one column of windows to the left of the entrance so it has to be the 4th column behind the lamp post. The brick outcrop next to the 4th window gives us Chaney and the pillar at the entrance give us JFK.
Ah....Therein lies the problem......Perhaps we can sort this out ....I believe that you're correct the the fourth set of windows is behind the lamppost.... BUT the third set of windows is NOT "BLOCKED OUT" by the concrete pylon. The third set of windows on the second floor, is visible in the background above the pylon. And the center divider ( mullion) in that third set of windows is an excellent anchor point for a line from the TSBD, through the pylon, through the Lincoln hood ornament to the camera. Chaney is seen to the left ( West) of that line.
I'm sure that the TSBD window that is visible above the concrete pylon is the THIRD set of windows...
Using the plat that was created by the Surveyor Robert West .......And working very carefully to be as precise as possible, We can locate the middle of the third set of windows and draw a line through the pylon and on across Elm street . James Algens was at the Elm street curb at the southern end of the line drawn.
Incidentally.... I wouldn't bet the farm that the traffic divider line is located where someone says it is.......You may recall that the back wound was conveniently moved up to JFK's neck...... so moving a traffic divider line is no problem....