The Pearl and Grand Avenue Historic District is a small residential neighborhood just north of Mukwonago's business district. The neighborhood developed shortly after the railroad came through the village in 1885 and continued to grow as the village prospered as an agricultural support center. The original residents were a mix of business and trades people and included four prolific builders: Joseph Clist, William Hillier, William Vick and Albert Grutzmacher. Noted residents such as agriculturist Asa Craig, "The Melon King," and lumberman and grain dealer Rolland Porter lived along Pearl Street.

Architectural styles include Queen Anne and Colonial Revival, as well as simpler homes which exhibit characteristics common to Mukwonago houses¿the truncated hip roof and the coved eave. Original materials utilized in the district include rock-faced and decoratively stamped concrete block, clapboard and brick. Thickly mortared fieldstone, used liberally for foundations and porches, is another hallmark design element of the community. The Spanish Colonial Revival style St. James Catholic Church (1926), located at 425 Grand Avenue, features this distinctive fieldstone in its foundation and wall buttresses. The most striking structure in the district is a garden folly at 212 Pearl Avenue, known as "Blarney Castle." Constructed of local limestone, this small interpretation of an Irish castle tower was built in 1897, the result of a friendly neighborhood gardening rivalry.

The residences in the Pearl and Grand Avenue Historic District are privately owned, please respect the privacy rights of their owners.