properties. Sec. 505. Elimination of coverage for properties with excessive lifetime claims. Sec. 506. Addressing tomorrow’s high-risk structures today. Sec. 507. Allowance for Write Your Own companies. Sec. 508. Enforcement of mandatory purchase requirements. Sec. 509. Satisfaction of mandatory purchase requirement in States requiring flood coverage in all-perils policies. Sec. 510. Flood insurance purchase requirements. I Policyholder protections and information 101. Annual limitation on premium increases Section 1308(e) of the National Flood Insurance Act of 1968 ( 42 U.S.C. 4015(e) ) is amended— (1) in paragraph (1), by striking 18 percent and inserting 15 percent