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The CSAIL 2021-C20 Commercial Mortgage Trust 10-K for fiscal year ended December 31, 2025, confirms full compliance with Regulation AB servicing criteria by all key servicers, including Midland Loan Services (master servicer), 3650 REIT Loan Servicing LLC (special servicer), Wells Fargo Bank (trustee/certificate administrator), and others like LNR Partners and Trimont for specific loans. No material instances of noncompliance were identified across assessments. The pool's major assets include The Grace Building Mortgage Loan (9.2% of cut-off date pool), Miami Design District Mortgage Loan (9.2%), MGM Grand & Mandalay Bay (6.0%), 888 Figueroa (6.2%), and The Westchester (5.4%), serviced under various PSAs/TSA with cross-collateralized structures. Servicing transitions noted, e.g., Trimont LLC as primary servicer for Grace Building and Miami Design District from March 1, 2025. All Item 1122/1123 reports affirm compliance, with auditors attesting. No financial statements provided as XBRL data unavailable; focus on operational integrity and no unresolved issues. Forward significance: Continued compliance supports investor confidence in this $1B+ CMBS trust amid stable servicing framework.