Purchasing a commercial office building through your business or investment structure can deliver rental income, asset appreciation, and tax benefits that residential property rarely matches.
The decision to buy commercial property typically comes down to whether the building will generate enough income to cover loan repayments, ownership costs, and still deliver a return that justifies the capital commitment. Unlike residential lending, commercial loans are assessed primarily on the property's ability to service debt rather than your personal income, which changes how lenders evaluate the application and structure the finance.
How Commercial Property Loans Differ from Residential Finance
Commercial property finance is structured around the income the building generates, not your salary. Lenders assess the property's net rental yield against the proposed loan amount, typically requiring a debt service coverage ratio that shows rental income exceeds loan repayments by at least 20% to 30%. This means a building generating $120,000 annually in net rent would support annual loan repayments of around $85,000 to $100,000, depending on the lender's policy.
Consider a business owner purchasing a two-level office building tenanted by medical and professional services firms. The property generates $180,000 in annual rent with outgoings of $35,000, leaving net income of $145,000. At a commercial interest rate of 6.5%, a loan of around $1.6 million would require annual principal and interest repayments of approximately $130,000, comfortably meeting the coverage requirement. The lender evaluates this transaction based on lease quality, tenant covenant strength, and occupancy history rather than the borrower's personal tax returns.
The Upside: Control, Income, and Tax Structure
Owning the building your business operates from eliminates rental volatility and gives you full control over fit-out, signage, and lease terms if you later sublease to other tenants. Rental payments your business makes to a related entity holding the property can be structured as deductible business expenses, while the property entity claims depreciation, interest, and ownership costs.
Commercial property also offers stronger long-term returns when location and tenant mix align. Multi-tenanted office buildings with staggered lease expiries reduce vacancy risk compared to single-tenant assets, and properties near transport hubs or within established business precincts tend to hold occupancy through economic cycles. You also retain the ability to strata-title and sell individual floors or suites if the building allows it, creating future flexibility.
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The Downside: Higher Deposits, Shorter Terms, and Ongoing Costs
Commercial lending typically requires a deposit of 30% to 40%, and loan terms are shorter than residential mortgages. Where a residential home loan might run for 30 years, most commercial property finance is structured with a term of 15 to 20 years, which increases repayment amounts and reduces cashflow flexibility during the loan period.
You also take on responsibility for all building maintenance, insurance, rates, and management costs, even during vacancy periods. A property sitting vacant for three months while you search for a new tenant still incurs holding costs that must be funded from other income sources. Lenders also review commercial loans more frequently, and may require updated valuations or financial statements at refinance if property performance or business circumstances change.
Structuring the Loan: Fixed, Variable, and Interest-Only Options
Most borrowers use a combination of fixed interest rate and variable interest rate debt when purchasing commercial property. Fixing a portion of the loan provides repayment certainty during the early years of ownership, while keeping part of the debt variable allows you to make extra repayments without penalty or access redraw if cashflow tightens.
Interest-only terms are common in commercial lending and can run for up to five years, reducing initial repayments and preserving working capital while the property establishes income. After the interest-only period ends, the loan reverts to principal and interest unless you negotiate an extension, which depends on continued strong property performance and borrower circumstances.
What Lenders Want to See Before Approval
Lenders assess commercial property purchases using a business plan, cashflow forecast, and current financial statements for both the borrowing entity and any guarantors. They want evidence that rental income is stable, lease documentation is current, and the building is tenanted by creditworthy occupiers with lease terms extending beyond settlement.
Your business credit score and trading history matter, particularly if the property will be owner-occupied or if rental income alone doesn't meet coverage requirements. In those cases, lenders may also assess your business revenue and personal financial position to ensure loan repayments can be met even if a tenant vacates or rental income falls temporarily.
If your business is purchasing the property to occupy, lenders may accept a lower debt service coverage ratio on the basis that the rent your business would otherwise pay externally now services the loan. This structure works particularly well for established businesses with consistent revenue, as it removes rental expense from the profit and loss statement and redirects it into asset ownership.
When It Makes Sense and When It Doesn't
Purchasing a commercial office building works when your business generates stable revenue, you have access to the required deposit, and the property's rental yield or cost-saving potential justifies the capital commitment. It also suits buyers who plan to hold the asset long-term and can manage vacancy risk without jeopardising business operations.
It's less suitable if your business is still in a growth phase and needs working capital for staffing, inventory, or expansion, or if the building's location or condition requires significant upfront investment before it can attract quality tenants. Tying up capital in property when your business could generate higher returns elsewhere is a common misstep, and one that becomes harder to reverse once the loan settles.
If you're considering a commercial property purchase and want to understand how the financing would affect your business cashflow, call one of our team or book an appointment at a time that works for you.
Frequently Asked Questions
How much deposit do I need to buy a commercial office building?
Most lenders require a deposit of 30% to 40% of the purchase price for commercial property. The exact amount depends on the property's rental income, tenant quality, and your business financial position.
How do lenders assess a commercial property loan application?
Lenders focus on the property's rental income and debt service coverage ratio, typically requiring net rent to exceed loan repayments by 20% to 30%. They also review lease documentation, tenant creditworthiness, and your business financial statements.
Can I use an interest-only loan to buy commercial property?
Yes, interest-only terms are common in commercial lending and can run for up to five years. This reduces initial repayments and preserves working capital, though the loan reverts to principal and interest unless you negotiate an extension.
What happens if my commercial property sits vacant?
You remain responsible for all loan repayments, insurance, rates, and maintenance costs during vacancy periods. Lenders expect you to demonstrate sufficient cashflow or reserves to cover these costs if rental income is interrupted.
Should I fix or keep my commercial loan variable?
Many borrowers split their loan between fixed and variable portions. Fixing part of the debt provides repayment certainty, while keeping part variable allows extra repayments and redraw access without penalty.
