Malmgren immigrated to the United States in 1888, initially settling in Seattle.

With the retirement of John Poetz in 1894/1895, the firm was restructured as Cutter & Malmgren.

The partnership closed in 1917, after which Karl Malmgren and Kirtland Cutter continued in individual practice.

Around 1919, Malmgren entered partnership with Spokane architect Charles I. Carpenter (1888-1938).

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