In 1989, the school system moved to a larger facility in the former Tech High School building. The Castle then became the property of the State of Nebraska. In 1996, the Joslyn Castle became home of the Joslyn Castle Institute for Sustainable Communities. The Institute was charged by the State of Nebraska with managing and preserving the estate. In December 2010, Joslyn Castle was sold by the State of Nebraska to the Joslyn Castle Trust, a private concern created for the purpose of maintaining the historic property.