(CNN) Renovations at Montclair State University in New Jersey uncovered a 112-year-old letter from the workers who built one of the original buildings on campus, the university said.

Robert Kanaby, a demolition worker, found the letter inside a beer bottle while taking down a wall in the College Hall building in February.

"It's a very old brick wall, about 14 feet with three layers of brick," Kanaby said. "So I was going brick by brick with a tool."

He heard glass break and knew something was wrong, he said. When he cleared the debris, he found the bottle with a letter inside.

"This is to certify that this wall was built by two bricklayers from Newark, N.J., by the names of William Hanly and James Lennon, members of No. 3 of the B.M.I.U. of America," read the letter, which was dated July 3, 1907.

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