An article on a research program for northern spotted owls (Strix occidentalis caurina) at a private facility in Langley, BC. B.C. spotted owl breeders hoping for new chicks as fertile eggs ready to hatch - Kimberley Daily Bulletin And here is its website: https://www.nsobreedingprogram.com/
My kneejerk reaction was to say Oregon Zoo, but their website doesn't list them, though i'm sure there are a few wildlife rehabilitation centres which have a couple non releasable specimens.