Looking east from Detroit Ave over destroyed neighborhoods towards the Tulsa Pressed Brick Company, Booker T. Washington high school is on the right in front of the brick company. The Chicago Defender article says that the three posts were Dr Thompson's house at 521 N. Detroit Ave. They also match the brickwork of Dr Bridgewater's house at 507 N. Detroit. If Dr. Thompson's house, the posts to the left indicate the position of the murdered Dr Jackson's house at 523 N. Detroit Ave.
This photo is a very porr quality reproduction from a microfilmed copy of the Chicago Defender.