Commercial Property Valuation

Commercial appraisers derive market cap rates from an analysis of recent, comparable sales. For each comparable transaction, they compute the implied cap rate by dividing the property's stabilized NOI (at the time of sale) by the sale price. The range and central tendency of these implied cap rates from 3-6 comparable sales forms the market cap rate bracket. The appraiser then adjusts within this range based on how the subject property compares to the comps in terms of location quality, building age and condition, lease term and creditworthiness of tenants, current occupancy, and recent capital expenditure investment. Published cap rate surveys from CBRE, JLL, Cushman & Wakefield, and Marcus & Millichap provide market-wide benchmarks but must be supplemented with local transaction data.

The going-in (entry) cap rate is the cap rate at the time of acquisition: purchase price / Year 1 stabilized NOI. The exit (terminal) cap rate is the assumed cap rate applied to the projected NOI in the sale year to estimate the terminal sale value in a DCF model. Exit cap rates are typically set 25-50 basis points higher than the entry cap rate to reflect the property's increased age at exit, general market uncertainty about future conditions, and the marginal buyer's perspective on an older asset. Using a lower exit cap than entry implies you expect market conditions or the asset to improve — a more aggressive assumption requiring explicit justification.

The Gross Rent Multiplier (GRM) or Gross Income Multiplier (GIM) equals the sale price divided by annual gross income (before expenses). It is a simpler and faster metric than cap rate, used for quick preliminary screening of smaller income properties where detailed expense data is not yet available. GRM = Price / Annual Gross Rent. If comparable small apartment buildings sell at GRM of 10, and your target property generates $100,000 in gross rent, the implied value is $1,000,000. GRM is less accurate than cap rate analysis because it ignores differences in expense structures between properties — two properties with the same gross income but dramatically different expense ratios will have the same GRM but very different cap rates.

Lease structure profoundly affects commercial property value. Triple-net (NNN) leases, where tenants pay property taxes, insurance, and maintenance directly, produce more predictable, lower-risk NOI streams and typically command lower cap rates (higher prices) than gross leases where the landlord pays operating expenses. Long-term leases with investment-grade tenants (national retailers, government agencies, publicly traded companies) further compress cap rates because income visibility reduces risk. Above-market leases boost current NOI and value but carry rollover risk when they expire; below-market leases suppress current value but may represent embedded upside if rents can be marked to market.

Price per square foot (PSF) is widely used as a quick comparative metric in commercial real estate. However, PSF values vary enormously by market, property type, and quality class. As a rough 2024 guide: Class A Manhattan office: $500-$1,500+ PSF; suburban office nationally: $100-$300 PSF; grocery-anchored retail: $200-$450 PSF; power center retail: $150-$350 PSF; bulk industrial nationally: $80-$200 PSF; urban last-mile industrial: $250-$600 PSF; multifamily (per unit): $150,000-$400,000 in major metros. PSF comparisons are only meaningful when comparing properties of similar type, class, and submarket — cross-market comparisons require cap rate normalization.

The cost approach values a property based on the estimated cost to reproduce or replace the improvements (at current construction costs per square foot) plus the separately estimated land value, minus depreciation (physical deterioration, functional obsolescence, and external obsolescence). This approach is most reliable for new construction (minimal depreciation), special-use properties (churches, schools, government buildings) where there are few comparable sales or income data, and for insurance purposes. It generally provides a value floor for commercial properties — a well-located income property with strong NOI typically sells above replacement cost (justifying new development), while an underperforming property may sell below replacement cost.

Effective Gross Income is the total income a commercial property is expected to generate after accounting for vacancy and credit loss, but before operating expenses. EGI = Potential Gross Income x (1 - Vacancy Rate) + Other Income. It matters because it forms the top line of the NOI calculation — errors in vacancy assumptions directly flow through to NOI and then to the capitalized value. A 1% difference in vacancy rate on a $1,000,000 gross income property changes EGI by $10,000, which at a 6% cap rate changes value by $167,000. In commercial underwriting, vacancy assumptions must be benchmarked against submarket data and the property's own historical performance.