Evaluate an office building by testing whether its documented income, realistic leasing prospects, physical condition, legal use, and financing support the price—not by accepting a seller’s projections or quoted cap rate. Rebuild the cash flow from leases and operating records, verify local market assumptions, investigate the property and its title, and stress-test the investment against vacancy, capital costs, and refinancing risk. This is a U.S.-oriented framework; market evidence and legal requirements depend on the property’s location and the transaction.
1. Define the investment and confirm what is being sold
Before underwriting returns, identify the exact property, ownership interest, and business plan. An office building’s value to you depends on whether you plan to hold it as-is, lease vacant space, renovate it, or reposition it for a different tenant base.
- Confirm the parcel, legal description, improvements, included equipment, and any contracts or service arrangements that transfer at closing.
- Identify tenant leases, parking and access rights, easements, restrictions, and any rights held by neighboring properties or affiliated service providers.
- Compare the legal description with the survey and the site as it exists. Have local counsel review the title commitment and underlying documents, including liens, encroachments, and easements.
- Ask local counsel and relevant professionals to confirm whether zoning, permits, and approvals allow the current use and your intended plan. Do not assume that existing use or a proposed zoning change is automatically permitted.
The U.S. EPA’s reuse assessment guidance identifies title searches, zoning, potential liens, encroachments, and building condition as matters that can affect transfer or reuse.
2. Rebuild the income from leases and cash records
A rent roll is a summary, not proof that scheduled rent is collectible or that tenants will stay. Reconcile it to executed contracts, amendments, billing, and cash receipts, then model each lease’s economics through its expiration.
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Records to request
- Current rent roll and all executed leases, amendments, side letters, and guaranties.
- Historical operating statements, general ledger, rent billing and collection records, arrears, tenant deposits, and capital-work records.
- Property tax and insurance bills, utility records, and service and maintenance contracts.
- Lease notices, defaults, tenant correspondence relevant to obligations, and records of landlord-funded work or concessions.
Lease terms to verify
Check base rent and escalations, free-rent periods, expense stops and pass-throughs, tenant obligations, renewal and termination rights, expansion options, assignment and sublease rules, security deposits, defaults, and landlord obligations. Distinguish physically occupied area from economically paying occupancy, and identify any tenant or affiliated arrangement responsible for a large share of income.
Build a lease-by-lease timeline that includes expirations and option dates, likely renewal terms, market rent at rollover, downtime, tenant improvements, and leasing commissions. Model the consequences if a major tenant leaves or re-leasing takes longer than expected; do not assume immediate re-leasing or renewal at today’s rent without supporting contractual and market evidence. Federal valuation guidance treats lease terms, rents, vacancy, concessions, and market changes as relevant inputs to value (Interagency Appraisal and Evaluation Guidelines).
3. Normalize expenses and calculate buyer-level NOI
Seller-reported net operating income (NOI) may not represent the income available to a new owner. Build a bridge from the seller’s figure to your own, documenting each adjustment and its source.
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- Separate recurring property operations from debt payments, income taxes, depreciation, acquisition costs, and owner-specific expenses.
- Check whether the historical statements omit recurring management, repairs, insurance, property taxes, utilities, security, cleaning, elevator, or HVAC costs.
- Verify expense recoveries against both lease language and collections. A contractual pass-through is not the same as money actually recovered.
- Separate ordinary operating expenses from capital work. Include a realistic schedule and reserve for major replacements and deferred maintenance in the cash-flow analysis rather than treating them as if they disappear.
For a simplified unlevered property view, NOI is property revenue after operating expenses but before financing costs, income taxes, depreciation, and capital expenditures. State clearly which income and expense assumptions your NOI includes; an as-is figure, a stabilized figure, and cash available after capital spending answer different questions.
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Office demand is submarket-specific. Gather evidence for the building’s actual competitive set rather than relying on a national headline or an asking rent that may not reflect concessions.
- Compare recent asking and executed rents, concessions, vacancy, leasing velocity or absorption where available, and recent comparable sales.
- Identify new and planned supply, tenant demand by suite size and building quality, and the leasing costs competitors offer.
- Separate asking rent from effective rent and specify whether vacancy data includes direct space, sublease space, or both. Note the source date, geography, and inventory covered for each statistic.
- Test whether the building’s floor plates, ceiling heights, systems, access, parking, amenities, and energy performance match the requirements of likely tenants.
The EPA’s reuse-plan guidance points to market climate, demand and vacancy, tenant requirements, lease rates, and building costs as relevant market-analysis inputs. There is no universal vacancy, rent, or cap-rate figure that can establish demand for an unidentified property; use dated evidence for the property’s location and competitive set.
5. Value the property with supported assumptions
A capitalization rate (cap rate) is generally calculated as an annual NOI measure divided by value or price. It is useful only when the NOI is representative and the rate is supported by relevant market evidence. A quoted cap rate alone does not show whether income is durable, whether major leasing costs are ahead, or whether the rate fits the property’s risk and expected cash flow.
Use valuation methods for what they can show
| Method | What it helps test | Key limitation to examine |
|---|---|---|
| Direct capitalization | Indicates value from a representative income measure and a market-supported cap rate. | Can obscure lease rollover, vacancy timing, capital spending, or a mismatch between current and stabilized income. |
| Discounted cash flow (DCF) | Makes multiple periods of income, leasing costs, capital spending, and an exit assumption visible. | Results depend on the reasonableness of forecast cash flows and discount and exit assumptions. |
| Comparable sales | Checks the price against relevant transactions. | Adjust for differences in financing, lease arrangements, tenant improvements, location, and building characteristics. |
| Cost approach | Can provide a cross-check where appropriate. | Is not an automatic substitute for market evidence or an income analysis. |
Show the path from current NOI to any stabilized NOI, including the time and cost required to reach it. Keep an as-is value distinct from a prospective value that assumes renovation, construction, or stabilization. Federal appraisal guidance calls for considering actual condition, use and zoning, and relevant market and economic factors; it cautions against unsupported assumptions such as average condition or an unapproved zoning change. It states: “A valuation method that does not provide a property’s market value or sufficient information and analysis to support the value conclusion is not acceptable as an evaluation.” (Interagency Appraisal and Evaluation Guidelines.)
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When using a DCF, do not treat its discount rate as interchangeable with a cap rate. Federal CRE workout guidance distinguishes a cap rate as a one-year or static measure from a discount rate applied to multiple future income periods (Policy Statement on Prudent Commercial Real Estate Loan Accommodations and Workouts).
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6. Inspect the building and price the capital plan
Use independent, qualified professionals appropriate to the asset. Review structure, roof, façade, elevators, HVAC, electrical and plumbing systems, fire and life-safety systems, accessibility, controls, parking, and relevant documentation. The scope should reflect the property, its age, intended use, and the condition of its systems.
Request repair and service histories, warranties, permits, code notices, and existing capital plans. Convert inspection findings into near-term and longer-term costs, then account for timing, contingency, tenant disruption, and any effect on leasing. Actual physical condition and building characteristics are also relevant to valuation under the federal appraisal guidelines linked above.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.7. Complete environmental and transaction-specific diligence
Engage an environmental professional to conduct a Phase I environmental site assessment (ESA) appropriate to the transaction. If you are seeking a CERCLA liability-protection objective, confirm that the assessment meets current All Appropriate Inquiries (AAI) requirements, including applicable timing. A Phase I assesses potential releases of hazardous substances and petroleum products and other environmental conditions; Phase II investigation may be warranted if Phase I findings call for further investigation.
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Assess whether asbestos, lead, mold, radon, underground storage tanks, historical uses, or institutional or engineering controls are relevant to this particular property. Account for investigation, remediation, monitoring, use restrictions, cost, and transaction timing. Consult environmental counsel on fact-specific liability questions. EPA describes the purpose of diligence this way: “Due diligence is conducted to obtain and verify available information regarding the property attributes and characteristics, physical and environmental condition, ownership, and other information relevant to its potential reuse and redevelopment.” (Revitalization-Ready Guide, Chapter 3: Reuse Assessment.)
8. Underwrite the actual loan and refinancing risk
Use lender proposals and, when available, the legal loan documents rather than generic debt-cost assumptions. Model scheduled payments, amortization, rate resets, covenants, reserves, recourse, fees, prepayment provisions, maturity, extension tests, and expected refinance proceeds. Financing terms and availability are lender- and borrower-specific.
Run downside cases that combine plausible pressures, such as lower rent, a tenant departure, slower lease-up, higher operating costs, larger capital needs, a higher exit cap rate, or tighter refinancing proceeds. Review debt-service coverage, covenant headroom, required equity, and cash available to meet obligations under those cases. Show unlevered property cash flow separately from levered equity cash flow so the effect of debt is explicit. Federal CRE underwriting guidance includes environmental risk assessment and analysis of a borrower’s ability to service debt; it does not replace an actual lender proposal (Section 244.17—Underwriting Standards for Qualifying CRE Loans).
9. Turn open issues into a documented decision
Maintain a diligence tracker with each item’s source, date, reviewer, finding, financial effect, open question, and deadline. For each material issue, decide whether to verify it before closing, obtain a specialist opinion, revise the plan, seek an appropriate contractual remedy, negotiate a price or escrow response, or terminate if available rights permit. Have counsel interpret the purchase agreement’s deadlines and contingencies; remedies differ by contract.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Proceed only if the documented income, local leasing evidence, condition and legal findings, capital plan, and actual debt terms support the price—and the investment remains workable under credible downside assumptions. If those assumptions depend on unverified lease income, unsupported rent growth, unbudgeted repairs, or an assumed refinance, the projected return is not yet decision-ready.
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