Claim: DeFerriere House, located at Oneida in Madison County, New York, is a 3-hectare Greek Revival house built in 1832.
Evidence: DeFerriere House is a historic home located at Oneida in Madison County, New York. 1832 7.3 acres (3.0 ha) Greek Revival The hectare (/ˈhɛktɛər, -tɑːr/; SI symbol: ha) is a non-SI metric unit of area equal to a square with 100-metre sides (1 hm), or 10,000 m, and is primarily used in the measurement of land.