What makes a mortgage commercial
A commercial mortgage is financing secured against real estate used primarily for business, investment or income-producing purposes.
Commercial real estate can include:
Office buildings
Retail plazas and storefronts
Industrial buildings
Warehouses
Medical and professional buildings
Hotels and hospitality properties
Five-plus-unit apartment buildings
Mixed-use properties
Self-storage facilities
Owner-occupied business premises
Development and construction land
Portfolios containing several commercial properties
OSFI’s current commercial real-estate guidance includes income-producing business property, acquisition and construction loans, five-plus-unit residential properties dependent on rental income, leased real estate and property occupied by the owner or a related business.
Classification: OSFI prudential guidance applying to federally regulated institutions active in commercial real-estate lending.
Source: Revised Regulatory Notice on Commercial Real Estate Lending.
Publication date: November 21, 2024.
Material qualification: OSFI establishes risk-management expectations. It does not prescribe one commercial mortgage product, DCR threshold or maximum LTV for every transaction.
Commercial underwriting begins with repayment source
A residential lender often begins with the borrower’s employment and personal income.
A commercial lender begins by asking:
What dependable cash flow will repay this mortgage?
For an income-producing property, the primary repayment source is usually property income.
For an owner-occupied building, repayment may depend on:
The operating company’s business cash flow
Rent paid by the operating company
Other tenants
Guarantor support
A combination of property and business income
The lender still reviews the borrower or sponsor, but a high personal salary does not compensate for an unsustainable commercial property.
Three broad commercial property models
| Model | Primary repayment source | Central underwriting issue |
|---|---|---|
| Owner-occupied commercial property | Operating-business cash flow | Can the business support occupancy costs and mortgage debt? |
| Investment commercial property | Rent and property NOI | Are leases, tenants and operating income stable enough? |
| Development or transitional property | Construction completion, lease-up, refinance or sale | Can the project reach stabilization within budget and on time? |
A property may combine all three. A business owner might occupy half an industrial building, lease the remaining space and plan an expansion.
Main commercial transaction types
Subsection — Acquisition
Financing is used to purchase a commercial property.
The lender reviews:
Purchase price
Appraisal
Equity contribution
Property income
Borrower experience
Environmental risk
Business purpose
Closing timeline
Subsection — Refinance
An existing commercial mortgage is replaced or increased to:
Reduce borrowing cost
Consolidate debt
Access equity
Fund improvements
Buy out a partner
Restructure ownership
Replace private or bridge financing
A refinance requires a current valuation and updated financial analysis.
Subsection — Bridge financing
Short-term financing may be used where:
Closing must occur before institutional underwriting is complete
A property requires stabilization
Leases are being renewed
Renovations are incomplete
Environmental or legal work is outstanding
An ownership transition must close quickly
A bridge should identify the takeout lender’s expected requirements before funding.
Subsection — Construction financing
Funds are advanced through draws as the project progresses.
The lender focuses on:
Land value
Construction budget
Borrower equity
Permits
Contractor experience
Cost overruns
Leasing or sale strategy
Completion guarantee
Permanent takeout financing
Subsection — Stabilization and takeout financing
A property becomes more financeable when it demonstrates sustainable operations.
Stabilization may require:
Defined occupancy
Completed construction
Signed leases
Rent collection history
Normalized expenses
Satisfactory environmental and building reports
Adequate DCR
A short-term construction or bridge lender may then be replaced by a longer-term commercial mortgage.
Net operating income
Net operating income, or NOI, measures property income after ordinary operating expenses but before mortgage debt service, income tax, depreciation and owner-specific financing costs.
Formula
Effective gross income = Gross potential income + Other recurring property income − Vacancy and collection loss
NOI = Effective gross income − Operating expenses
Revenue may include
Base rent
Additional rent
Parking
Storage
Laundry
Signage
Recoveries from commercial tenants
Other recurring property income
Operating expenses may include
Property taxes
Insurance
Utilities paid by the owner
Repairs and maintenance
Property management
Cleaning and superintendent expenses
Landscaping and snow removal
Administration
Security
Replacement reserve where required
Mortgage principal and interest are not deducted when calculating NOI. They are evaluated through debt-service coverage.
Stabilized NOI versus reported NOI
The lender may adjust the borrower’s reported income where:
Rent is above or below market
A unit is temporarily vacant
Repairs were deferred
Management expense is omitted
Related parties pay non-market rent
A temporary tax or utility expense distorted one year
A major tenant’s lease expires soon
The building requires capital expenditure
Commercial appraisers are expected to analyze market rent, comparable operating expenses and market-derived capitalization or discount rates when using the income approach.
Classification: Professional appraisal standard.
Source: Appraisal Institute of Canada, CUSPAP 2024.
Material qualification: The lender may make underwriting adjustments that differ from the appraiser’s final valuation analysis.
Debt coverage ratio
Debt coverage ratio measures how much property cash flow is available relative to required mortgage payments.
Formula
Debt coverage ratio = Net operating income ÷ Annual qualifying mortgage debt service
Interpretation
DCR = 1.00 means NOI exactly equals mortgage debt service.
DCR = 1.20 means the property produces $1.20 of NOI for each $1.00 of mortgage debt service.
DCR below 1.00 means the property does not fully support the mortgage from its own NOI.
The required DCR varies by lender, property, interest rate, term, amortization and insurance program.
OSFI expects federally regulated commercial lenders to assess NOI, global financial condition, equity at risk, sponsor experience and current and future debt-service capacity.
Capitalization rate
Capitalization rate connects annual NOI with property value.
Formula
Capitalization rate = Net operating income ÷ Property value × 100
Rearranged:
Indicated property value = Net operating income ÷ Capitalization rate
A higher cap rate produces a lower indicated value from the same NOI. A lower cap rate produces a higher indicated value.
Cap rates may differ because of:
Property type
Location
Building age
Tenant strength
Lease duration
Vacancy
Market liquidity
Interest rates
Expected capital expenditure
Environmental or functional risk
Commercial loan sizing
The maximum commercial mortgage is generally constrained by several tests.
Formula
LTV-supported loan = Accepted property value × Maximum lender LTV
DCR-supported annual debt service = Stabilized NOI ÷ Required DCR
Maximum commercial mortgage = Lowest amount supported by LTV, DCR, lender policy and transaction limits
The property may have enough value for the requested loan but insufficient NOI.
The reverse can also occur: cash flow may support a larger loan, but the lender limits leverage because the property is specialized or difficult to sell.
Worked Example 1: DCR-based loan sizing
Assumptions
Stabilized NOI: $300,000
Required DCR: 1.25
Illustrative mortgage rate: 6.50%
Amortization: 25 years
Monthly payments
Accepted property value: $4,800,000
Illustrative maximum LTV: 70%
Canadian semi-annual mortgage convention
No fees or reserves included
Variables
NOI = $300,000
RDCR = 1.25
ADS = Maximum annual debt service
LTVL = LTV-supported loan
DCRL = DCR-supported loan
Maximum annual debt service
ADS = NOI ÷ Required DCR
ADS = $300,000 ÷ 1.25
ADS = $240,000 annually
Monthly debt-service capacity:
$240,000 ÷ 12 = $20,000 monthly
At 6.50% over 25 years, a $20,000 monthly payment supports a mortgage of approximately:
DCRL = $2,986,000
LTV-supported amount
LTVL = Accepted value × Maximum LTV
LTVL = $4,800,000 × 70%
LTVL = $3,360,000
Result
DCR-supported loan: approximately $2,986,000
LTV-supported loan: $3,360,000
The lower amount is approximately:
Maximum supported mortgage = $2,986,000
Interpretation
The lender is constrained by property cash flow, not value.
Even though the accepted value supports $3.36 million at 70% LTV, the NOI supports only about $2.99 million under the stated DCR, rate and amortization assumptions.
Worked Example 2: capitalization-rate sensitivity
Assumptions
Stabilized NOI: $300,000
Scenario A cap rate: 5.50%
Scenario B cap rate: 6.50%
Scenario A
Indicated value = $300,000 ÷ 5.50%
Indicated value = $5,454,545
Scenario B
Indicated value = $300,000 ÷ 6.50%
Indicated value = $4,615,385
Result
A one-percentage-point cap-rate change reduces the indicated value by approximately:
$5,454,545 − $4,615,385 = $839,160
Interpretation
Commercial value can change materially even when the building’s NOI remains unchanged.
This is why refinancing based on a future appraisal should not assume that rents alone determine value.
Worked Example 3: tenant-rollover stress
Assumptions
Current stabilized NOI: $300,000
Annual mortgage debt service: $240,000
One tenant contributes $75,000 of NOI
The tenant does not renew
No replacement tenant is immediately available
Current DCR
DCR = $300,000 ÷ $240,000
DCR = 1.25
DCR after tenant loss
Revised NOI = $300,000 − $75,000
Revised NOI = $225,000
Revised DCR = $225,000 ÷ $240,000
Revised DCR = 0.94
Result
The property moves from a 1.25 DCR to approximately 0.94.
Interpretation
A building can qualify from today’s rent roll but become unable to service the mortgage after one material lease expires.
The underwriter therefore examines lease duration and tenant concentration—not merely current occupancy.
Lease analysis
The lender may review:
Tenant name and business
Lease commencement and expiry
Renewal options
Base rent
Additional rent
Free-rent periods
Deposits
Arrears
Termination rights
Assignment rights
Related-party tenancy
Tenant improvements
Leasing commissions
Percentage rent
Guarantors
Concentration by tenant or industry
A long lease is not automatically strong if the tenant has weak financial capacity or broad termination rights.
Tenant quality
A lender may distinguish among:
Government or major institutional tenant
National company
Established local business
New operating company
Related-party tenant
Month-to-month occupant
Vacant space supported only by market rent
Tenant quality affects:
Income stability
Valuation
DCR stress
Amortization
LTV
Renewal risk
Sponsor strength
The sponsor is the person or group behind the borrowing entity.
The lender may assess:
Net worth
Liquidity
Real-estate experience
Credit history
Other projects
Contingent liabilities
Guarantees
Capital invested
Ability and willingness to support shortfalls
OSFI expects regulated lenders to review sponsor and guarantor liquidity, net worth, contingent liabilities and track record supporting other loans.
Commercial appraisals
A commercial appraisal may include:
Income approach
Direct capitalization
Discounted cash flow
Comparable-sales approach
Cost approach
Market rent
Vacancy
Stabilized expenses
Remaining economic life
Highest and best use
Zoning
Environmental assumptions
Capital expenditure
Lease analysis
The lender may accept a value below the purchase price or borrower’s estimate.
Environmental reports
A commercial lender may require:
Environmental questionnaire
Phase I Environmental Site Assessment
Phase II investigation
Remediation report
Reliance letter
Environmental insurance
Ongoing monitoring
Environmental review is particularly relevant for:
Gas stations
Automotive uses
Dry cleaners
Industrial property
Manufacturing
Historical fuel storage
Contaminated neighbouring sites
Older mixed-use buildings
An acceptable appraisal does not eliminate environmental risk.
Property management and operating records
Common documents include:
Rent roll
Leases
Two or three years of operating statements
Current year-to-date results
Property-tax bills
Insurance
Utility statements
Capital-expenditure history
Property-management agreement
Bank statements
Vacancy history
Accounts receivable
OSFI expects ongoing commercial-loan monitoring to include current NOI, tenancy, rent rolls, cash-flow sustainability, guarantor strength and property value.
Five-plus-unit apartment properties
Apartment buildings with five or more units are normally analyzed through commercial or multi-unit residential underwriting.
CMHC’s standard rental-housing insurance currently applies to eligible projects with at least five units and at least 70% residential content by both floor area and lending value. The standard program permits up to 85% LTV, subject to its detailed DCR, borrower, property and guarantee requirements.
Classification: CMHC multi-unit mortgage-insurance policy.
Current status: Accessed July 23, 2026.
Material qualification: MLI Select and other CMHC multi-unit programs have separate requirements and flexibilities.
Commercial underwriting diagram
Borrower or sponsor
↓
Property type and use
↓
Rent roll and operating statements
↓
Stabilized NOI
↓
Required DCR
↓
Commercial appraisal and LTV
↓
Lower supported loan amount
↓
Conditions, guarantees and exit
What the underwriter is thinking
The commercial underwriter is asking:
What will repay this mortgage?
Is the NOI sustainable?
Which expenses have been omitted or understated?
Are rents contractual and collectible?
When do major leases expire?
How dependent is the property on one tenant?
What capital expenditures are approaching?
Does the sponsor have liquidity?
Has the sponsor successfully operated a similar property?
Is the appraisal supported by market evidence?
Is environmental risk acceptable?
What happens if rates rise, occupancy falls or the takeout is delayed?
HopeWell Case Study
Hamilton mixed-use title transfer with more than 20 units
A Hamilton transaction involved an income-producing property with residential and commercial components and more than 20 total units.
The financing supported an ownership and title transition.
Many lenders were not interested because the file combined:
Multi-unit residential income
Commercial space
Title-transfer complexity
A property outside ordinary small-residential underwriting
A narrower lender market
The file was structured through private mortgage investors comfortable with mixed-use income-producing property.
The analysis focused on:
Property income
Residential and commercial marketability
Ownership transition
Lender appetite
A future path toward more conventional commercial financing
The underwriting lesson: A commercial mortgage is not approved merely because the property has substantial value. The lender must understand the income, legal structure, property mix and exit.
Pattern We See
Commercial files often fail before the lender reaches the rate discussion.
The real problem is frequently one of:
Incomplete operating statements
Unreconciled rent roll
Lease expiry
Missing environmental work
Unexplained related-party rent
Inadequate sponsor liquidity
Purchase price unsupported by NOI
Ownership or title complexity
Wrong lender category
Common Reasons Files Fail
Gross rent is presented instead of NOI
Borrower omits vacancy and management costs
Property expenses do not reconcile with tax returns
Major lease expires shortly after closing
Related-party rent is above market
Appraisal assumes unsupported market rent
Phase I Environmental Site Assessment is ordered too late
Borrower lacks required equity or liquidity
Sponsor has hidden contingent liabilities
Property management is inadequate
Construction or renovation budget is incomplete
DCR is calculated using the contract rate where the lender uses a higher qualifying rate
Lender is approached without confirming property-type appetite
Private bridge has no institutional takeout plan
Important Warning
A commercial approval can contain:
Personal guarantees
Corporate guarantees
General security agreements
Assignment of rents
Environmental indemnities
Financial covenants
Reporting obligations
Restrictions on additional borrowing
Demand features
Cross-default provisions
These terms require legal review. The interest rate alone does not describe the borrower’s risk.
If You Remember Only Three Things
Commercial mortgages are sized primarily from sustainable property or business cash flow, not the borrower’s salary alone.
The maximum loan is generally limited by the lower of DCR capacity, LTV capacity and lender policy.
Lease quality, sponsor strength, appraisal and environmental risk can matter as much as current NOI.