The present courthouse was designed by Urbana, Illinois architect Joseph Royer in the Beaux-Arts style.

[5] The Linn County Courthouse is a three-story Bedford stone structure built on a granite foundation.

Classical elements are found in the full entablature and the protruding, nine-bay entrance porch.

A stone balustrade surrounds the terrace, and balconies on the first floor windows flank the entrance pavilion.

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