Mr. Hayes (Doctor?)
The information on Trulia is driven from the Tax Records as is the case for
many of the internet real estate sites. The Napa County tax records show the
property as having a "County Use Code" of Multi-Res 2-4 Units and a "Universal
Land Use" of Multi Family 10 Units or less. These codes normally define what is
possible for the property, ie, what could be build there and may not reflect the
actual improvements that do exist. From your description, a home and guest
cottage, the Multi-Res 2-4 Units is certainly applicable...
All else being equal, and it hardly ever is, a Multi-Res property is more valuable
as it would normally generate more varied use and greater income..
Please feel free to contact me if you would like further information on real
estate in Napa.