I spent quite a bit of time at 1642 Park Ave. growing up because that was the house of my friend, Chris Dean, who lived there with his family. We had heard that 1642 Park was quite an old house, and had been built by a lake captain.
According to the Wisconsin Historical Society: Historic Name: Williams, Captain Henry O., House. Reference Number: 11244. Year Built: 1870. Architectural Style: Queen Anne. The light fixtures in the front room and sitting room are believed to date from the 1920s, when the house was wired for electricity.
Henry O. Williams was born in approximately 1848 and died in approximately 1920. Therefore, if he were a captain, his career would have lasted him up to around age 50 or 60, which would have been 1898 to 1908 or so. He seems to have been a wealthy man around 1905 when he owned 50% in Merchants Hotel.

1920 Census for 1642 Park Ave. Here it says that Henry O. Williams was born in Wisconsin, but other places say he was born in Wales.
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Mrs. Henry O. Williams and daughter have returned from a four months’ trip to England. Racine Journal News, 1921 08 13

Household goods for sale, Racine Journal News, 1922 04 10 (I wonder if they just got around to selling Elizabeth Scott’s furniture two year later? They may have been storing it in the barn for two years.)