Contra Costa County
Property with an ADU or multiple residential units
When an estate property includes an ADU, guest unit, duplex-style use, or other additional residential space that affects its utility.
Additional living units can raise questions about permitted status, physical layout, rental use, separate access, and how buyers viewed the configuration.
Contra Costa County estates may involve everything from older West County homes and central-county suburbs to hillside, luxury, rural-edge, and Delta-oriented residential properties.
The appraisal scope should identify what is known about the units and analyze the property as the market recognized it on the relevant date.