IMBY recently discovered an interesting RERBG article about Park Slope's 8th Avenue from 1912. The article features several photographs, including a view looking north from President Street before the tall apartment buildings were constructed on the west side of that block:
Real Estate Record and Builders' Guide, May 18, 1912, p. 1
The buildings on the east side of 8th Avenue (right side in the photo above) are unchanged to the present day. But the buildings on the west side have been replaced by tall apartment buildings.
The RERBG article indicates that the house at the northwest corner of 8th Avenue and President Street, visible to the left in the photograph above, was originally the residence of Civil War General C. T. Christensen.
An idea of General Christensen's prominence can be gleaned from a New York Times article of 1903, noting both his 5oth wedding anniversary and the marriage of Violet, one of his daughters. The article notes that General Christensen "was for many years identified prominently with the military, social, and business life of Brooklyn. He was a long time President of the Brooklyn Trust Company, and prior to that he was connected with the banking house of Drexel, Morgan, & Co.":
It seems that Gen. and Mrs. Christensen were blessed with many daughters. An 1889 article from the Brooklyn Eagle recounts the presentation of the Misses Laura and Hope Christensen "as candidates for the favors of society" at their home on the corner of 8th Avenue and President Street:
Many of the tall apartment houses in 8th Avenue are similar "second growth" buildings, erected on soft development sites originally occupied by large mansions with spacious gardens.