John A. Green Estate

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The John A. Green Estate (also known as the Green-Nissen Estate) is a historic property in Stone City, Iowa, United States.

The estate covers 200 acres (0.81 km2) of land. The buildings were constructed of Anamosa Limestone quarried from John Green's own local business.

The estate was placed on the U.S. National Register of Historic Places in 1978. On March 17, 1868, then a lonely spot in the wilderness, now the site of Stone City, Iowa, John A.

Green opened the Champion quarries. For nearly fifty years, the quarries produced steadily, amounting to more than 4.5 billion dollars in sales. 1896 records indicate 1,000 men were employed among the quarries, carving 160,000 loads of stone in a single year with a market value of 3.75 million dollars.

In his most productive years (1869-1890s), John Green operated three quarries (known as "Champion 1," "Champion 2," and "John Allen") using nearby Anamosa State Penitentiary labor.