In an earlier "Lost Park Slope" post, we visited the George C. Tilyou residence that once stood at 35 Prospect Park West. We established that George Tilyou died in 1914, and that his widow Mary sold the house to developers, who erected the present Emery Roth-designed apartment house in 1929. Mary Tilyou occupied the penthouse apartment until her death, aged 103, in the 1950s.
The Museum of the City of New York's online image collection includes many photographs of the interior of Mary Tilyou's penthouse apartment, a few of which appear below.
The scale of the rooms suggest an extremely spacious apartment:
Although there are at least three penthouse apartments now, it is possible that they were subdivided from a single colossal penthouse once occupied by Mary Tilyou.
The rest of the photographs of the penthouse apartment can be viewed here.