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How an office building’s income becomes a value estimate
For an income-producing office property, the income approach estimates the cash flow a typical owner could reasonably expect. It starts with market-supported income—not simply the current asking rent or the owner’s accounting profit—and accounts for vacancy, collection risk, lease reimbursements, and operating costs. The California State Board of Equalization describes the income approach as relevant when a property is typically purchased for income and has, or can be assigned, an income stream: Summary (The Income Approach to Value).
- Estimate potential income. Multiply rentable area by supportable market rent, then add other property income where applicable. Contract rent may differ from market rent.
- Deduct vacancy and collection losses. Use market-supported expectations rather than treating the current vacancy snapshot as a forecast.
- Calculate effective gross income. This is the income remaining after those losses.
- Deduct appropriate operating expenses. Read the leases to establish which expenses the owner bears and which tenants pay or reimburse. Account for the lease structure consistently so an expense is not deducted twice.
- Estimate NOI. The result is net operating income under the assignment’s definitions and conventions. NOI is not the same as gross rent, gross yield, or cash flow after financing and income taxes.
The inputs depend on the lease documents as well as market evidence. A tenant may pay certain costs directly, reimburse the landlord, or leave the landlord responsible for them. The Board of Equalization’s training material explains the need to identify the responsibilities assigned by each lease and to use market rent, vacancy and collection losses, and operating expenses to process the income stream: The Income Approach to Value.
What the cap rate does—and does not—tell you
When annual income is expected to be relatively stable, direct capitalization can convert stabilized NOI into an indicated value:
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Indicated value ≈ stabilized NOI ÷ market-supported cap rate
For the same NOI, a higher cap rate produces a lower indicated value; a lower cap rate produces a higher one. The cap rate is a market pricing measure that reflects investors’ return expectations and perceived risk. It is not a physical feature of the building or a percentage an owner can select to justify a desired price. It should be supported by relevant market evidence and reflect differences in location, quality, subtype, lease and property-specific risk. CBRE’s H1 2025 survey discusses how cap rates vary with asset location, quality, and property-specific characteristics: U.S. Cap Rate Survey, H1 2025.
The simple formula is useful only when the NOI and rate are consistent in their assumptions and represent a sustainable income stream. A one-year figure distorted by unusual vacancy, lease-up, or spending may not represent stabilized performance.
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When a discounted cash-flow analysis is more useful
A discounted cash-flow (DCF) analysis estimates income and costs across multiple future periods and discounts those cash flows to present value. It can show the timing of staggered lease expirations, tenant turnover, lease-up, tenant improvements, leasing commissions, major capital work, rent changes, and eventual sale more explicitly than a single stabilized-year cap rate.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsThat detail does not make a DCF assumption-free. Rent growth, vacancy downtime, leasing costs, discount rate, and terminal value all need market support. Federal Reserve appraisal guidance discusses both direct capitalization and net-present-value methods and stresses consistency among risk, return, financing, and income assumptions: Interagency Appraisal and Evaluation Guidelines.
How leases and tenants affect value
Leases determine what income is contractually due, when it may change, and what costs remain with the owner. Their terms can make two otherwise similar buildings worth different amounts.
- Contract rent versus market rent: Above-market or below-market rent can affect the income from the leased interest and the timing and cost of re-leasing.
- Tenant credit and concentration: A tenant’s ability to pay affects collection risk. Dependence on one large tenant can make that tenant’s departure or lease expiration especially consequential.
- Remaining term and expiration pattern: Lease length, clustered expirations, renewal options, break rights, and contractual rent steps shape future income and potential vacancy.
- Renewal and new-leasing costs: Downtime, concessions, tenant-improvement allowances, and leasing commissions reduce the cash flow available to an owner.
- Expense recoveries: The leases determine which taxes, utilities, repairs, and other costs tenants pay or reimburse and which remain the owner’s responsibility.
The property interest being valued also matters. Fee-simple ownership and a leased-fee interest are not interchangeable descriptions of the same cash-flow rights. Federal Reserve guidance notes that a long-term lease below market with a highly rated tenant can make a leased-fee interest worth less than an unencumbered fee-simple interest. Appraisal instructions and analysis should identify which interest is being valued rather than assuming every assignment covers the same rights: Interagency Appraisal and Evaluation Guidelines.
Why location, building quality, and market conditions matter
A submarket’s access, tenant demand, competing supply, and leasing conditions influence achievable rents, absorption, and vacancy. The building’s condition, layout, systems, efficiency, amenities, and suitability for likely tenants can affect rent, operating costs, capital needs, downtime, and investor risk. These characteristics matter through their effect on expected income and risk; they do not create an automatic dollar premium without local evidence.
Broader interest rates, required investor returns, credit availability, office-occupier demand, and the balance of supply and demand influence pricing and cap rates. Those conditions should be assessed as of the valuation date and tested against local rents, vacancies, sales, and financing evidence rather than inferred from a national trend.
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As dated U.S. context, the Federal Reserve’s April 2025 Financial Stability Report said inflation-adjusted aggregate commercial real estate prices had been stable since its November report following significant declines in 2022 and 2023. It reported that office had experienced the largest price declines in 2022 and 2023, that transaction volumes picked up in 2024 Q4 including for office, and that vacancy rates and rent growth showed signs of stabilizing. The report also warned that transaction-based price indexes may not fully capture conditions when owners defer sales in the hope of better selling conditions. These observations describe national conditions reported in April 2025, not current 2026 conditions or a forecast for a particular building: Financial Stability Report.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How other valuation approaches check the result
The income approach is often central when typical buyers purchase a building for its income and a supportable income stream can be estimated. Other approaches can test that result, but each answers the question from different evidence.
- Sales comparison: Compares relevant transactions after accounting for differences in property rights, financing, lease arrangements, location, and building characteristics. A sale price is informative only when those differences are understood and adjusted appropriately.
- Cost approach: Considers land value and the cost of improvements, with appropriate depreciation. It may help when income or sale evidence is limited, but depreciation and functional obsolescence can be difficult to estimate for an older building.
Reconcile the approaches according to the assignment, likely buyer behavior, property, and relative strength of evidence; do not mechanically average their indications. The Appraisal Foundation’s Uniform Standards of Professional Appraisal Practice (USPAP) provides standards for appraisal work, while Federal Reserve guidance discusses analysis of sales and income evidence: Interagency Appraisal and Evaluation Guidelines.
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What to check when reviewing an appraisal or price opinion
A valuation is only as persuasive as its assumptions and evidence. For a purchase, sale, financing decision, or appraisal review, check whether it identifies:
- the effective valuation date, intended use, and property interest being valued;
- the market area and the evidence supporting rent, vacancy, expense, and cap-rate assumptions;
- the leases, rent roll, tenant credit and concentration, reimbursements, and upcoming expirations;
- physical condition, required capital work, and the building’s competitiveness for likely tenants;
- how comparable sales differ in financing, lease arrangements, location, quality, and rights transferred;
- why the chosen valuation approaches were relevant and how their results were reconciled.
National commentary cannot establish the value of an individual building. Local evidence, lease documents, inspection, property rights, and the valuation date determine whether the assumptions fit the asset. A general explainer is not a property-specific appraisal or investment recommendation.
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