1845
A large brick house was built in Beloit, with a conspicuous front portico supported by four tall Corinthian columns.
BeloitGrade A · 1 independent source
The evidence
“Brown, D.D., who still lives here, which stood on the south side of the public landing at the southwest corner of Turtle and School streets (a couple of rods back from Nos. 328 and 330 State street fronts, as now built up), at the west end of School street, facing east. It was built in 1845, solidly of brick, two stories and attic, 44x24 feet in ground dimensions, having a conspicuous front portico suported by four tall Corinthian columns, and in all its appointments was for that date a model of artistic taste and architectural skill. The first Presbyterian Society was formed within its walls in 1849, and the hospitalities of its owner and his New England wife, a pure-minded Christian lady, were there dispensed with unfailing generosity until the house and surrounding stores were all destroyed by fire in 1871.”
1908-brown-rock-county/06-history-of-beloit.md, Vol. 1, PDF p. 172 / book p. 155
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
Grade A: Found on a page of one of our sources