When Albert Mason purchased the Nichols-built home next door to the east, his general manager in the Kiowa Lumber Company, Henry L. Leonhardt, bought these lots and started work on a two-story airplane bungalow. Typically, it was distinguished by the half-story upstairs, exposed rafter tails, and pyramidal columns supporting abroad front porch.

Leonhardt, a native of St. Petersburg, Russia, came to America and settled in Kansas where he found a job with J.W. Metz, a merchant with stores in Kiowa, Ingersoll, and Wichita, Kansas. Leonhardt quickly became manager of Metz’ lumber yard in Kiowa. In 1919 Leonhardt moved to Oklahoma City and opened a branch store of the Kiowa Lumber Company at 4th and Western. After he and his wife, Della, moved into the house on 21st, Leonhardt continued his successful career and eventually opened the Leonhardt Lumber Company and Big L Stores. The Leonhardts remained in the house until 1925, when they built a home on 18th.

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