Looking northwest, the playground is behind the house. The so-called casino was actually a recreational clubhouse for men built to look like a house in order to blend in with the neighborhood. It is no longer standing and its land has been taken over by the playground. To the left is 53 Francis St., no longer standing and also part of the playground today.
Note the feeder station hydrant used by the dirt-street-watering carts.

[Courtesy of the Digital Commonwealth (CC BY-NC-ND). From the Brookline Photograph Collection published by the Public Library of Brookline]