For a larger glossary of many terms used in property appraisal, please see the International Association of Assessing Officers' Glossary for Property Appraisal and Assessment .


One cause of depreciation; an impairment of desirability and usefulness caused by new inventions, changes in design, improved processes for production, or other external factors that make a property less desirable and valuable for a continued use; may be either functional or external.


A three digit number that describes the type and use of a building. Occupancy codes are maintained by the Marshall & Swift Valuation Service of CoreLogic .

Operating Expenses

The periodic expenditures necessary to maintain the flow of income from a property.

Overall Age/Life Method

Method of estimating accrued depreciation based on straight-line depreciation in which the building is assumed to depreciate by a constant percentage each year over its economic life.


An improvement that does not represent the most profitable use for the site on which it is placed because it is too large or costly and cannot develop the highest possible land value; may be temporary or permanent.


The full name of the primary owner of the property parcel.(e.g. John P. Doe).

Owner of Record

The owner of title to a property as indicated by public records.

Ownership Type

A description of ownership type as provided by the Assessee, including proprietorship, partnership, corporation or business trust.