Top © 2009 Montessori Foundation of Washington dba Sundborn Children's House. All Rights Reserved. Page Updated on Thursday, June 3, 2010 5:25 PM The Sundborn Children's House is the only school operated by the Montessori Foundation of Washington, a nonprofit IRS 501(c)(3) Foundation. The Montessori Foundation of Washington does not discriminate in matters of employment, recruitment, admission, or the administration of any of its programs on the basis of race, creed, national or ethnic origin or gender.