Use both properties:
Appendix A to Subpart A of Part 365—Interagency Guidelines for
Real Estate Lending Policies:
"... In situations where a loan is fully cross-collateralized by two or more properties or is secured by a collateral pool of two or more properties, the appropriate maximum loan amount under supervisory loan-to-value limits is the sum of the value of each property, less senior liens, multiplied by the appropriate loan-to-value limit for each property..."
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CRCM
"Do or do not ... There is no try"