Building Lasting Opportunities for Community K–12 Act or the BLOCK ActThis bill repeals on October 1, 2025, specified formula grants for programs administered by the Department of Education (ED). Beginning with FY2026, ED must instead provide block grants for these programs to each state based on amounts received in FY2025.Specifically, the bill repeals the following allocation formulas for programs under the Elementary and Secondary Education Act of 1965:the Education for the Disadvantaged program (which includes Basic Grants, Concentration Grants, Targeted Grants, and Education Finance Incentive Grants);State Assessment Grants;the Migrant Education Program;Prevention and Intervention Programs for Children and Youth Who Are Neglected, Delinquent, or At-Risk;Supporting Effective Instruction State Grants; English Language Acquisition State Grants;Student Support and Academic Enrichment Grants;the 21st Century Community Learning Centers program;the Rural Education Achievement Program (which includes both the Small, Rural School Achievement Program and the Rural and Low-Income School Program); andIndian Education Formula Grants.