The discovery of this 19th-century ad campaign prompted some questions, the first being: "Why is Gilbert Bostwick Croff's name is spelled CROFTT in the ad?" This question remains unanswered.
We know that Croff, who had his office in Saratoga Springs, designed 4 Willard Place for Frank Chace. An elevation drawing of the house's facade appears in Croff's book, Progressive American Architecture.
Frank Chace's house at 4 Willard Place was completed in 1874.
Esselstyn's house was completed in 1875, the same year Croff ran his ad for days on end in the Hudson Daily Star. One can only imagine that with one house of his design completed and another under construction, Croff was looking for more commissions in Hudson. It is not known if he got them or not.
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Thanks to Russell Gibson for providing information for this post