The U.S. Army Corps of Engineers, Kansas City District, seeks a web-based nationwide real estate database subscription providing confirmed and personally verified sales and lease data for all property types to support staff appraisers. The data must go beyond county and MLS records by verifying transaction details with all parties involved, ensuring compliance with federal appraisal standards including the Uniform Appraisal Standards for Federal Land Acquisitions (UASFLA). This is a sources sought notice for market research only, not a solicitation, and no contract will be awarded from this notice. No budget amount, performance location, or submission timeline is specified. Responses are voluntary and must be submitted electronically to the listed contract specialists.