A commercial property can look compelling on a brochure: a recognised tenant, an attractive yield and a long lease term. But the investment outcome is determined by what sits behind those headline figures. A disciplined commercial property due diligence checklist helps you test the income, the tenant, the building and the contract before you commit capital.
For Australian investors, particularly those building a portfolio alongside residential assets, commercial due diligence is not simply a longer version of a standard property inspection. The risks are different. Vacancy periods can be longer, lease obligations carry more weight, and a building with a sound-looking tenant today may face major capital works or reletting challenges tomorrow.
Why commercial due diligence needs a different lens
Commercial property is typically valued by its capacity to produce income. That means the tenant covenant, lease structure and market rent can matter as much as the physical asset itself. A property returning a high yield may be correctly priced for a reason: a weak tenant, an approaching lease expiry, excessive incentives, poor location fundamentals or substantial maintenance liability.
The objective is not to find a property with no risk. Every commercial asset has trade-offs. The objective is to identify the risks early, quantify their likely cost and decide whether the purchase price and lease terms compensate you appropriately.
A thorough process also protects your broader investment strategy. An industrial unit with a secure tenant may offer a different role in a portfolio than a neighbourhood retail shop or a medical suite. The right acquisition depends on your borrowing capacity, cash-flow requirements, growth horizon and appetite for managing vacancy or capital expenditure.
Commercial property due diligence checklist
1. Verify the title, zoning and permitted use
Start with the legal identity of the asset. Review the certificate of title, plan, easements, covenants, restrictions and any rights of way. An easement may be entirely manageable, but it can affect access, parking, loading or future redevelopment options.
Confirm the local council zoning and whether the current use is permitted. Do not rely solely on the agent’s description of the property as retail, office, medical or industrial. Check whether the tenant’s use is lawful, whether approvals are current and whether any planning controls could limit future use, expansion or redevelopment.
For strata commercial property, inspect the by-laws, strata records, sinking fund position, insurance arrangements and minutes from owners corporation meetings. Repeated discussion of water ingress, façade works, fire compliance or special levies warrants closer investigation.
2. Analyse the lease, not just the lease term
The lease is the income-producing engine of the investment. Obtain the executed lease, all variations, disclosure statements, incentive deeds, options and any side agreements. A lease summary is useful, but it is not a substitute for the underlying documents.
Review the commencement and expiry dates, option periods, rent review method, outgoings recovery, make-good provisions, assignment rights and landlord obligations. A five-year lease with a five-year tenant option is not the same as a firm ten-year income stream. Likewise, fixed annual rent increases may provide certainty, while CPI-linked reviews can move with inflation but may be subject to caps or collars.
Pay close attention to incentives. A headline rent can overstate the income if the landlord has provided a large rent-free period, fit-out contribution or cash incentive. Calculate the effective rent over the lease term and understand when any incentive costs are recognised.
3. Assess the tenant’s financial strength
A lease is only as reliable as the tenant’s ability and willingness to meet it. Investigate the tenant entity named on the lease, not merely the trading brand on the signage. The business may operate through a subsidiary with limited assets, while a stronger parent company has provided no guarantee.
Look for financial statements where available, trading history, payment behaviour, director history, industry conditions and credit reports. If the tenant is private, disclosure may be limited. In that case, the guarantee structure becomes even more significant.
Clarify whether there is a bank guarantee, personal guarantee or parent company guarantee, and whether it remains valid through the full lease term. For a single-tenant asset, this assessment is particularly important because a tenant failure can turn a strong yield into an immediate vacancy problem.
4. Test the rent against the market
Do not assume the passing rent reflects current market value. Compare it with recent leasing evidence for similar properties in the immediate precinct, taking account of building quality, access, parking, fit-out, exposure and lease incentives.
If the passing rent is above market, the property may face a valuation or reletting risk at expiry. If it is below market, there may be upside, but only if the market evidence supports it and the tenant can sustain an increase. A well-located warehouse with a below-market rent can be attractive. A retail tenancy with an inflated rent in a weakening strip is a different proposition.
Also consider vacancy evidence. Asking rents can create an optimistic impression where comparable premises have remained empty for months. Your cash-flow model should allow for realistic downtime, leasing fees, fit-out contributions and marketing costs if the tenant vacates.
5. Inspect the building and forecast capital expenditure
Engage appropriately qualified building, pest and specialist consultants where the asset warrants it. The inspection should go beyond cosmetic presentation and examine the roof, structure, drainage, electrical systems, air conditioning, fire services, accessibility and any signs of moisture or cracking.
For industrial assets, assess truck access, hardstand, loading capacity, clearances, power supply and environmental exposure. For office and retail, examine air conditioning, lifts, amenities, façade condition and compliance requirements. Older buildings may offer value, but only if the likely upgrade costs are properly allowed for.
Request maintenance records, warranties, compliance certificates and details of recent repairs. Identify which costs can be recovered from the tenant under the lease and which remain the landlord’s responsibility. A net lease can still leave an owner exposed to structural repairs, replacement air conditioning units or major compliance works.
6. Review environmental and compliance risk
Environmental risk varies materially by asset type and location. Former industrial sites, automotive uses, dry cleaners, service stations and properties near contaminated land require a more detailed assessment. Contamination can affect financing, insurance, resale value and redevelopment potential.
Confirm fire safety compliance, asbestos registers where relevant, disability access obligations, essential services records and any outstanding notices from council or other authorities. If the building has been altered, verify that approvals and occupation certificates are in place.
This is an area where the level of investigation depends on the asset. A modern strata office suite may require a lighter review than an older freestanding industrial facility, but neither should be assessed on assumptions alone.
7. Model the real return after all costs
The advertised yield is a starting point, not an investment decision. Build a cash-flow model that includes purchase costs, finance costs, land tax, council rates, insurance, management fees, maintenance, vacancy allowances and expected capital expenditure.
Stress-test the investment against scenarios such as a six-month vacancy, a lower market rent at renewal, higher interest rates or a required incentive to secure a replacement tenant. The result will show whether the property continues to support your portfolio if conditions are less favourable than forecast.
Also consider the exit. Who is the likely future buyer? A small strata office with a short lease may appeal to a different buyer pool than a leased industrial facility with strong access and a national tenant. Liquidity matters when you need to refinance, sell or reallocate capital.
Make the contract period work for you
A contract subject to due diligence is valuable only when the timeframe is realistic and the conditions are specific. Your solicitor should review the contract, lease documents, disclosure obligations and any special conditions before exchange wherever possible.
Use the due diligence period to request missing documents, commission reports and resolve discrepancies. If the vendor cannot substantiate claimed outgoings, lease guarantees, approvals or building compliance, treat that as decision-relevant information rather than an administrative delay.
Commercial acquisitions reward preparation. The strongest investors are not those who move fastest on every opportunity, but those who can assess an asset with enough rigour to act decisively when the evidence supports it. A clear checklist turns a promising commercial property into a measured decision – and keeps one overlooked detail from becoming an expensive portfolio problem.
