If a separate APN, then it appears to be excess and has a separate value from the improved lot.
Check zoning (if none then you're good to go) to see if you can develop it.
Now. The real question is who is the ultimate lender or backing the lender. FNMA? FHA? VA? "Conventional" is not an answer. If secondary market they have specs on whether or not the second lot is included.
FHA
Excess Land. The value of the second lot must be excluded from the final value conclusion of the appraisal and the Appraiser must provide a value of only the principal site and improvements under a hypothetical condition.
FNMA
he table below provides the requirements when the security property consists of more than one parcel of real estate.
✓ | Multiple Parcels Requirements |
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| Each parcel must be conveyed in its entirety. |
| Parcels must be adjoined to the other, unless they comply with the following exception. Parcels that otherwise would be adjoined, but are divided by a road, are acceptable if the parcel without a residence is a non-buildable lot (for example, waterfront properties where the parcel without the residence provides access to the water). Evidence that the lot is non-buildable must be included in the loan file. |
| Each parcel must have the same basic zoning (for example, residential, agricultural). |
| The entire property may contain only one dwelling unit. Limited additional non-residential improvements, such as a garage, are acceptable. For example, the adjoining parcel may not have an additional dwelling unit. An improvement that has been built across lot lines is acceptable. For example, a home built across both parcels where the lot line runs under the home is acceptable. |
| The mortgage must be a valid first lien that covers each parcel. |