How Do We Decide and Check Our Work? Triangulation, Decisions & Taxes
How to turn a valuation into a defensible decision and check it for reasonableness. Why honest valuation produces a range, not a point; the three approaches to value and what each captures; the four quick checks — price per unit, price per square foot, GRM, and implied cap rate; where practitioners source cap rates, comps, and replacement costs, and each source’s bias; reading method divergence as information; one- and two-variable sensitivity tables and coherent scenarios; NPV, IRR, MIRR, and the equity multiple on a worked $30M deal, with investment value vs. market value and the hold/sell/refinance/renovate rule; and the tax layer — property and income classification, depreciation, after-tax cash flow, and tax at sale — that can flip the verdict.
170 min
19
29
4
Learning Objectives
By the end of this chapter you should be able to:
- 1Defend a valuation range: explain why honest valuation produces a range rather than a point estimate, and support the claim with the appraisal accuracy evidence.
- 2Deploy all three approaches: state what the income, sales comparison, and cost approaches each capture, where each breaks down, and when each deserves the most weight.
- 3Run the quick checks: screen any deal in minutes with price per unit, price per square foot, gross rent multiplier, and implied cap rate.
- 4Source the inputs: name the professional data sources for cap rates, comparable sales, and replacement costs, and state each source’s bias.
- 5Read divergence as information: diagnose what it means when cost exceeds income value, DCF exceeds direct cap, or comps diverge from income approaches.
- 6Map the range with sensitivity and scenarios: build one-variable and two-variable sensitivity tables and coherent base, downside, and upside cases.
- 7Decide with NPV, IRR, and their repairs: compute NPV, IRR, MIRR, and the equity multiple on the module’s worked deal, separate investment value from market value, and choose among holding, selling, refinancing, and renovating.
- 8Put taxes into the cash flows: classify property and income for tax purposes, compute depreciation and after-tax cash flows, estimate taxes due at sale, and state when the tax layer changes the investment decision.
Part One: Valuation Theory Overview. Section 1 of 19.
Part One · Honest Valuation Produces a Range, Not a Point
Valuation Theory Overview
Part One
Honest Valuation Produces a Range, Not a Point
Every valuation method requires assumptions, and different reasonable assumptions can produce different values. This is not a flaw in the process; it reflects the nature of real estate. A credible valuation is best understood as a supported range, even when the final conclusion is reported as a single point estimate.
Valuation Theory Overview
Every valuation method requires assumptions. Different reasonable assumptions can produce different values. This is not a flaw in the process; it reflects the nature of real estate. Unlike publicly traded securities with continuous price discovery, real estate transactions are infrequent, properties are heterogeneous, and information is unevenly distributed. As a result, a credible valuation is best understood as a supported range, even when the final conclusion is reported as a single point estimate.
Market value is commonly defined in appraisal practice as the most probable price a property should bring in a competitive and open market under normal sale conditions. The word probable matters. A property concluded at $28 million is not "worth exactly" $28,000,000 in a scientific sense. Rather, $28 million represents the analyst’s best supported conclusion within a reasonable range, perhaps $26 million to $30 million, depending on the evidence and assumptions.
Cole, Guilkey, and Miles (1986) examined appraisal values and transaction prices using institutional real estate data and found meaningful differences between appraised values and sale prices. Their work is often cited as evidence that real estate valuation contains unavoidable estimation error. The practical lesson is not that appraisals are unreliable; it is that valuation precision should not be overstated. A $10 million appraisal and a sale price modestly above or below that figure can both be consistent with normal valuation uncertainty.
The key question is not, "Is this number exactly right?" The better question is: What assumptions produce this number, how strong is the evidence behind them, and how sensitive is the value to changes in those assumptions?
Professional standards reinforce this point. USPAP does not mechanically require every valuation approach in every assignment. It requires the appraiser to develop a scope of work sufficient to produce credible assignment results, use methods appropriate to the assignment, and reconcile the evidence and approaches applied. The appraiser must determine which approaches are relevant, apply them carefully, and explain how the final conclusion is supported.
This chapter examines the three standard approaches to value: the income approach, sales comparison approach, and cost approach. It also covers quick-check metrics used for sanity testing and the process of triangulating multiple indicators into a defensible value range. The goal is not false precision. The goal is a well-supported valuation conclusion with a clear explanation of where the property most likely falls within the range.
Law 6: There is only one certain answer to any valuation model question. It depends.