There is also an 1880s adobe house that was built by John Rowland 's son , William R. Rowland .
Is under the ownership of the City of Walnut and is at Lemon Creek Park .
There is also an 1880s adobe house that was built by John Rowland 's son , William R. Rowland , and is under the ownership of the City of Walnut and is at Lemon Creek Park .