Building, Mason Valley, located at 1 S. Main St. in Yerington, Nevada, is a building designed by prominent Nevada architect Frederick J. DeLongchamps that was built in 1913–14.

It was listed on the National Register of Historic Places in 1983.

[1] It was deemed significant for its association with the community development of Yerington, in which the International Order of Odd Fellows group played a role, and for being designed by DeLongchamps.

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