Section 86.18 - How can I ensure that a BIG-funded facility continues to serve its intended purpose for its useful life?(a) When you design and build your BIG-funded facility, you must consider the features, location, materials, and technology in reference to the geological, geographic, and climatic factors that may have an impact on its useful life.(b) You must record the Federal interest in real property that includes a BIG-funded capital improvement according to the assurances required in the grant application and guidance from the Regional WSFR Office.(c) If we direct you to do so, you must require that subgrantees record the Federal interest in real property that includes a BIG-funded capital improvement.(d) If we do not direct you to act as required by paragraph (c) of this section, you may require subgrantees to record the Federal interest in real property that includes a BIG-funded capital improvement.(e) You must state in your subaward that subgrantees must not alter the ownership, purpose, or use of the BIG-funded facility as described in the project statement without the approval of you and the WSFR Regional Office.(f) You may impose other requirements on subgrantees, as allowed by law, to reduce State liability for the BIG-funded facility. Examples are insurance, deed restrictions, and a security interest agreement, which uses subgrantee assets to secure performance under the grant.