National Aeronautics and Space Administration (NASA). This NASA Procedural Requirements. Effective Date September 1, 1998. Expiration Date: September 1, 2008. 132 p. This NPR provides a ready reference to policy and requirements for the management and utilization of NASA Real Property assets. The document is designed to provide uniform and orderly processes for meeting NASA`s strategic and infrastructure Real Property needs against a background of reinvention and fundamental changes to management approach