This excerpt taken from the UNH 10-K filed Mar 6, 2007.
As of December 31, 2006, we owned and/or leased real properties totaling 12.4 million square feet to support our business operations in the United States and other countries (net of approximately 0.7 million square feet of space subleased to third parties). Of this total, we leased approximately 11.6 million aggregate square feet of space and owned approximately 1.5 million aggregate square feet of space. Our leases expire at various dates through May 31, 2025. Our facilities are primarily located in the United States. Our various segments use these facilities for their respective business purposes, and we believe these current facilities are suitable for their respective uses and are adequate for our anticipated future needs.