6.3 Functional and External Obsolescence

6.3 Functional and External Obsolescence

Understanding how to identify, categorize, and mathematically measure obsolescence is one of the most rigorously tested subjects on the Certified General Appraiser examination.

---

1. Functional Obsolescence: Deficiencies and Superadequacies

Functional Obsolescence is the impairment of functional capacity, desirability, or market utility resulting from flaws in the structure's design, layout, materials, equipment, or architectural features relative to modern market preferences.

+-------------------------------------------------------------------------+
|                   FUNCTIONAL OBSOLESCENCE MATRIX                        |
+------------------------------------+------------------------------------+
|            DEFICIENCIES            |          SUPERADEQUACIES           |
|   (Building lacks an item or       |   (Building has an item exceeding  |
|    features an inadequate design)  |    market standards / over-built)  |
+------------------------------------+------------------------------------+
|  CURABLE:                          |  CURABLE:                          |
|  - Cost to install today minus     |  - Cost to remove minus salvage    |
|    cost if included in new         |    value plus remaining RCN        |
|    construction (today's prices)   |                                    |
+------------------------------------+------------------------------------+
|  INCURABLE:                        |  INCURABLE:                        |
|  - Measured by Capitalized Net     |  - Measured by Capitalized Excess  |
|    Rental Loss attributable to     |    Operating / Maintenance Costs   |
|    the structural inadequacy       |    or RCN vs. Replacement Delta    |
+------------------------------------+------------------------------------+

The Four Classifications of Functional Obsolescence

1. Curable Functional Deficiency

• Definition: The property lacks an item, fixture, or architectural feature that is demanded by the current market, and it is economically feasible to install or retrofit the item ($\text{Value Added} \ge \text{Cost to Cure}$).
• Measurement Formula (Retrofit Penalty): $\text{Curable Functional Obsolescence} = \text{Cost to Add the Item Now} - \text{Cost of the Item if Included in New Construction}$ Both costs are measured as of the effective date: the second figure is what the item would cost as part of building the structure new today.
• Economic Rationale: If an owner must spend $50,000 today to install modern ADA-compliant automated lobby doors that would cost $30,000 if included in new construction today, the property suffers $20,000 of functional obsolescence. The $30,000 is not in the cost-new estimate for a building that lacks the doors, so only the $20,000 retrofitting penalty (excess cost) is deducted.

2. Incurable Functional Deficiency

• Definition: A structural deficiency or design defect where the cost to correct or modify the element exceeds the anticipated value increase, or where physical constraints render structural modification impossible.
• Examples: A suburban warehouse with 16-foot clear ceiling heights in a submarket where modern distribution logistics demand 32-foot clear heights; an office building with massive interior load-bearing columns spaced on an obsolete 20-foot grid that impedes modern open-plan office layouts; lack of freight elevators in a multi-story light industrial building.
• Measurement Method: Capitalization of the Net Operating Income (or Net Rental) Loss attributable to the deficiency: $\text{Incurable Functional Obsolescence} = \frac{\text{Annual Net Rent Loss Attributable to Deficiency}}{R_o}$ (Note: If the appraiser utilizes Gross Rent Loss, it is multiplied by the market Gross Income Multiplier (GIM), adjusting for any physical deterioration already captured).

3. Curable Functional Superadequacy

• Definition: An over-improvement or excessively specialized component whose cost exceeds the value it adds to the property, but where market conditions make it economically desirable to remove, abandon, or alter the item to make the building functional for a typical user.
• Measurement Formula: $$\begin{aligned} \text{Curable Superadequacy Obsolescence} = & \text{ Current Reproduction Cost of Superadequacy} \\ - & \text{ Physical Depreciation Already Deducted} \\ + & \text{ Cost to Remove / Cure} \\ - & \text{ Salvage Value of Removed Item} \end{aligned}$$
• Impact of Replacement Cost: When the appraiser uses Replacement Cost New (RCN), the superadequate item is not in the cost estimate, so its reproduction cost is not deducted; any cost to remove it, less salvage, is still charged when removal is the economic cure.

4. Incurable Functional Superadequacy

• Definition: An over-engineered structural assembly or excessive equipment installation that cannot be economically removed or altered, and for which typical market participants will not pay a premium.
• Examples: A heavy reinforced concrete floor slab engineered to support 1,500 pounds per square foot (PSF) in a light distribution center where typical logistics users only require 250 PSF; an oversized 400-ton central chiller plant installed in a building requiring only 150 tons.
• Measurement Method: Incurable superadequacies frequently generate ongoing excess operational penalties (higher electric consumption, higher maintenance contracts, higher insurance premiums). The obsolescence is measured by capitalizing the excess operating expenses: $\text{Incurable Superadequacy Obsolescence} = \frac{\text{Annual Excess Operating Expenses}}{R_o}$ If the cost estimate is reproduction cost, the deduction also includes the superadequate item's reproduction cost less physical deterioration already charged; with replacement cost, only the capitalized excess costs of ownership remain.

---

2. External Obsolescence: Locational and Economic Causes

External Obsolescence (historically termed economic or locational obsolescence) is an impairment in the desirability or economic utility of a property caused by factors outside the boundaries of the subject real estate.

+-------------------------------------------------------------------------+
|                    FORMS OF EXTERNAL OBSOLESCENCE                       |
+------------------------------------+------------------------------------+
|       LOCATIONAL OBSOLESCENCE      |        ECONOMIC OBSOLESCENCE       |
|   - Immediate off-site environment |   - Broad macroeconomic conditions |
|   - Proximity to nuisance/hazard   |   - Regional industry collapse     |
|   - Highway rerouting / loss of    |   - Elevated interest rates        |
|     access or visibility           |   - Chronic market oversupply      |
+------------------------------------+------------------------------------+

Key Principles of External Obsolescence

1. Incurability: External obsolescence is almost universally incurable by the property owner. Because the adverse influences lie completely beyond the property boundary lines, no expenditure by the property owner can eliminate or relocate the external nuisance.
2. Two Primary Causes:
   • Locational Obsolescence: Arises from immediate off-site environmental conditions, such as the construction of an adjoining sewage treatment plant, permanent street closures or highway realignments that eliminate retail drive-by traffic and visibility, proximity to airport flight paths (noise and vibration), or adjacent blighted, abandoned properties.
   • Economic Obsolescence: Arises from broad market, economic, or governmental forces, such as the permanent shutdown of a region's primary automotive manufacturing employer, national high interest rate spikes that suppress tenant expansion capital, chronic structural oversupply of competitive space in the submarket, or restrictive legislative mandates.

---

3. Measuring and Allocating External Obsolescence

General appraisers utilize two primary quantitative techniques to measure external obsolescence: Capitalization of Net Income Loss and Paired Sales (Market Comparison) Analysis.

1. Capitalization of Net Income (Rent) Loss

When an external factor causes the subject property to suffer lower rental rates or higher long-term structural vacancy, the capitalized income loss measures the total loss in property value: $\text{Total External Loss} = \frac{\text{Annual Net Operating Income Loss Attributable to External Factor}}{R_o}$

2. Paired Sales (Market Comparison) Analysis

The appraiser compares sales of properties affected by the external adverse factor against sales of otherwise identical properties located in unaffected benchmark neighborhoods. The percentage price differential isolates the total external obsolescence.

Mandatory Rule: Allocation Between Land and Building Improvements

The Building Allocation Formula

$\text{Building Allocation Ratio} = \frac{\text{Depreciated Cost of Building Improvements}}{\text{Total Property Value (Land + Depreciated Improvements)}}$ $\text{External Obsolescence Attributable to Improvements} = \text{Total Capitalized External Loss} \times \text{Building Allocation Ratio}$

Worked Numerical Example: External Obsolescence Allocation

An appraiser is valuing an 80,000 SF Class B Suburban Office Park:

• Due to the unexpected closure of an adjoining regional corporate headquarters and subsequent submarket oversupply, the subject suffers an annual net operating income loss of $64,000.
• The market-extracted overall capitalization rate ($R_o$) is 8.0%.
• Total Capitalized External Value Loss: $\text{Total External Loss} = \frac{\$64{,}000}{0.08} = \$800{,}000$
• Market analysis of comparable sales indicates a typical land-to-building value relationship in this submarket of 25% Land and 75% Building Improvements.
• Allocation to Building Improvements: $\text{External Obsolescence to Improvements} = \$800{,}000 \times 0.75 = \mathbf{\$600{,}000}$
• The remaining $200,000 of loss is absorbed by the underlying land and is already reflected in the appraiser's independent site valuation.