July 23, 1850
The first church edifice (First Presbyterian), at the southeast corner of Broad and Pleasant streets in Beloit, costing about ten thousand dollars, was dedicated.
BeloitGrade A · 1 independent source
The evidence
“tee, the first church edifice, southeast corner of Broad and Pleasant streets, and costing about ten thousand dollars, was dedicated, July 23, 1850, substantially free of debt. The successive pastors have been: Rev.”
1908-brown-rock-county/13-beloit-churches.md, Vol. 1, PDF p. 296 / book p. 271
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