Castleman Avenue between 39th Street and Spring Avenue continues the trend of its eastern block before Grand Boulevard with no alleys, but the houses are newer, reflecting more English influence in its architecture.
There is more the influence of the Arts and Crafts movement, with half timber and designs in the brick, reflecting more of an appreciation of vernacular details, though still obviously on a very high level of finish.
Sadly, I figured out the home of Oscar Berninghaus at 3939 Castleman Avenue has been demolished, and its lot turned into a side yard for its neighbor.
We begin to see more of the influence of the Colonial Revival in the massing of the houses below, even if the ornamental details are not so much in that style. We see that often in St. Louis.
Then there are these two massive, hulking masterpieces in brick that are clearly older towards the end of the block, providing an anchor architecturally at the intersection with Spring Avenue.
Again, notice how the architect understand this house will be sitting on a corner and places details on the east side to create visual interest along Spring Avenue, while still focusing on the primary side facing Castleman.