Despite what appears to be a return to a debate about fundamental issues involved in corridor
appraising, there are perhaps some things that the appraisal profession can agree on from the history
of the development of corridor valuation techniques as expressed in the published literature of the
profession. From the debate about corridor valuation issues and methods since 2000, the following
• The purpose of the corridor valuation assignment is crucial to a determination of the proper
appraisal method or methods to be applied.
• Case law continues to drive the appraisal process, the selection of the appropriate valuation method,
an understanding of the property rights involved in the appraisal assignment, and the applicability
of such issues as definition of the larger parcel and how jurisdictional definitions of terms such as
market value, fair market value or just compensation affect the appraisal assignment.
• ATF value is almost always a proper starting point in a corridor valuation assignment. However, it
may not always be the most appropriate method given the purpose of the assignment. It may be
only one among several methods (including estimation of net liquidation value) that the appraiser
may need to address.
• The most appropriate valuation method or combination of methods depends in large part on the
highest and best use of the corridor. Is the highest and best use continued use as a corridor? Or is
the highest and best use abandonment and dismantling of the corridor in a liquidation?
• Data is now available from hundreds of corridor transactions all
across the country that makes the possibility of the appropriate
application of the sales comparison approach to the value of an
entire corridor or portion of a corridor feasible in theory.
• Corridor sales transactions also allow calculations to determine
if there is a “corridor” factor that should be considered when
appraising an existing corridor for continued use.
• There have been thousands of negotiated “subservient easement”
transactions involving fiber optic transmission lines, pipelines, and
power line corridors in the past two decades, but accessing that data
is often difficult due to confidentiality concerns.
The debate and discussion about corridor valuation issues and methods
will go on. The purpose of the remaining chapters in this book is to add to