The view of this photo (looking back and up to Harlem – if you were headed to the Bronx you’d be traveling to the right and down) shows a recently competed 155th Street Bridge that now goes from Harlem over to the Bronx near Yankee Stadium.
Note how isolated many of the buildings on the horizon seem to be. They’re built with no neighbors, just fields. The close-up (below shows the horizon in more detail):
The city developed by leap-frogging, not by a continuous wave of building.
You might be able to recognize this building, also in the distance:
The flag is in front of the Morris-Jumel Mansion – sitting proudly by itself on a hill overlooking the Bronx.