The constitutionally required "just compensation" in partial takings is usually measured by fair market value of the part taken, plus severance damages (the diminution in value of the property retained by the owner when only a part of the subject property is taken). Where a partial taking provides economic benefits specific to the remainder, those must be deducted, typically from severance damages. The former owners of the property will rarely receive full market value because some elements of value are deemed noncompensable in eminent domain law.