|Location||15 Portland Place, St. Louis, Missouri, US|
Robert W. Walsh
Caspar D. Boisselier
|Architectural style||Colonial Revival architecture|
|Part of||Portland and Westmoreland Places (ID74002276)|
|Designated CP||February 12, 1974|
It is located near the northeastern corner of Forest Park, at 15 Portland Place.
The mansion was built c. 1900, for William D. Orthwein, a German immigrant. It was designed in the Neoclassical architectural style, by Frederick Widmann, FAIA (1859-1925), Robert W. Walsh, FAIA (1860-c.1929) and Caspar D. Boisselier.
William D. Orthwein, his wife Emily and family lived there for 27 years.
William D. Orthwein's son William R. Orthwein was living there when he competed at the 1904 Summer Olympics, held in St Louis, in the freestyle and backstroke swimming and water polo, winning bronze medals in the 4x50-yard freestyle relay and water polo.
- Stephen J. Raiche (April 20, 1973). "National Register of Historic Places Inventory - Nomination Form: Portland and Westmoreland Places" (PDF). Missouri Department of Natural Resources State Historic Preservation Office. Retrieved October 5, 2015. Includes a map of the district.
- "Orthwein Mansion - Portland and Westmoreland Places - St. Louis, Missouri". Way Marking. Retrieved 25 August 2015.
- Julius K. Hunter; Robert C. Pettus; Leonard Lujan (1988). Westmoreland and Portland Places: The History and Architecture of America's Premier Private Streets, 1888-1988. University of Missouri Press. pp. 53–. ISBN 978-0-8262-0677-0. Retrieved 6 October 2015.
- Mannino, Fran. "Tour Central West End's Portland Place". West End World. Retrieved 6 October 2015.
- "Portland and Westmoreland Places". National Park Service. Retrieved 25 August 2015.
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