Loss-to-Lease & Economic Concessions in Commercial NOI
When underwriting commercial real estate, relying on top-line Gross Potential Rent (GPR) without adjusting for Loss-to-Lease, tenant rent concessions, model units, and bad debt creates dangerous cash flow over-estimates. Lenders normalize rent rolls to calculate true underwritable Net Operating Income.
Key Financing Parameters & Standards
Institutional Market Reference
Loss-to-Lease DefinitionThe difference between market market rent and actual in-place contractual lease rates across all units
Loss-to-Lease FormulaTotal Gross Market Rent minus Actual Gross In-Place Rent
* Certified tenant rent rolls and trailing 12-month (T12) operating statements are required to verify revenue deductions.
Understanding Loss-to-Lease on Commercial Rent Rolls
Loss-to-Lease represents the unrealized revenue resulting from tenants paying rents below current prevailing market rates. If a 100-unit apartment community has a market rent of $2,000/month per unit ($200,000/mo total), but existing leases average only $1,800/month ($180,000/mo total), the monthly Loss-to-Lease is $20,000 ($240,000/year).
While sponsors view Loss-to-Lease as future upside to be captured upon lease rollover, commercial mortgage lenders base loan sizing strictly on actual in-place collections, deducting Loss-to-Lease from gross pro-forma projections.
Accounting for Upfront vs Amortized Rent Concessions
In competitive leasing markets, landlords offer concessions—such as "1 Month Free on a 12-Month Lease"—to attract tenants without lowering reported contract face rent. Underwriters normalize concessions using two methods:
Upfront Cash Deduction: Deducting the full dollar value of all free rent granted during the trailing 12-month period directly from gross revenue.
Straight-Line Amortization: Amortizing the free rent across the lease term. For example, a $2,400 monthly rent lease with one month free yields an effective net rent of $2,200/month ($26,400 total rent divided by 12 months).
Non-Revenue Units and Bad Debt Adjustments
Underwriters audit rent rolls for non-revenue units: employee units granted to property managers, leasing model units, and courtesy police officer suites. These units are stripped from revenue calculations.
Additionally, lenders apply a contractual bad debt allowance (typically 0.5% to 2.0% of gross revenue) reflecting uncollectible rent, eviction delays, and bounced tenant payments, establishing conservative net underwritten NOI.
Frequently Answered Questions
Common Questions About Loss-to-Lease & Economic Concessions in Commercial NOI
Direct, transparent answers regarding underwriting standards, documentation, and process.
Loss-to-Lease
What is Loss-to-Lease on a commercial real estate rent roll?
Direct Answer
Loss-to-Lease is the difference between current market rents and the actual in-place rents paid by existing tenants under signed leases, representing unrealized top-line revenue potential.
Lenders deduct Loss-to-Lease from market potential rent to base loans solely on verified in-place collections.
Concessions
How do lenders treat "one month free rent" concessions when underwriting a commercial loan?
Direct Answer
Lenders normalize free rent concessions by either deducting the total annual cash concession value from gross revenue or straight-line amortizing the discount across the full lease term to calculate true effective rent.
This prevents landlords from inflating property NOI with artificially high face rents.
Economic Vacancy
What is the difference between physical vacancy and economic vacancy?
Direct Answer
Physical vacancy measures empty unoccupied square footage, while economic vacancy includes physical vacancy plus lost revenue from rent concessions, delinquent bad debt, and non-revenue employee units.
Economic vacancy reflects the true total dollar loss against gross potential property revenue.
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