Commercial Property Due Diligence Checklist: What to Check Before You Buy

Most buyers who lose money on commercial property don't lose it because they paid too much. They lose it because they missed something they should have found before exchange.

Commercial property due diligence in Australia is not complicated, but it is disciplined. It requires working through a structured set of assessment criteria systematically, not selectively, before committing capital. This checklist covers eleven key areas every buyer should assess, what to look for in each, and what a red flag actually looks like.

1. Zoning and Planning

What to check: Confirm the current zoning through the state planning portal. Verify that the existing use of the property is a permitted use within the zone and not a non-conforming use which may have been grandfathered from a prior planning scheme.

Red flag: The property is operating under a non-conforming use, meaning the current use is not permitted today. If the tenancy vacates, the use cannot be re-established which present a risk to future income replacement. You won't see this talked about in a real estate agents information memorandum.

Why it matters: Zoning determines what the asset can lawfully do. A zone change or a lapsed non-conforming use can eliminate the asset's commercial viability at the next lease expiry, permanently damaging the capital value.

2. Title Search and Encumbrances

What to check: Obtain a title search from the relevant state titles registry. Review for easements, covenants, caveats and any encumbrances that restrict the use, development, or transfer of the land.

Red flag: Covenants limiting commercial use on part of the site, easements that reduce effective site area or restrict building placement, or caveats suggesting a third-party interest in the property the vendor has not disclosed.

Why it matters: Encumbrances cannot be negotiated away post-settlement. A covenant that restricts commercial use on half the site is a permanent constraint on the asset's value and lease flexibility.

3. Lease Review

What to check: Obtain and read the full executed lease, not a tenancy schedule summary. Key items: lease term and remaining WALE, passing rent versus market rent, rent review mechanism (fixed percentage, CPI, or market), outgoings structure (gross, net, or semi-gross), make good provisions, options to renew, assignment rights, and permitted use clause.

Red flag: Rent reviews set at fixed percentage increases well below CPI, gross leases with no ability to recover outgoings increases from tenants, or passing rent materially above market with a market review upcoming that will reset income downward. A 7-year WALE with a near-term market review to below-passing rent is not the asset it appears to be.

Why it matters: The lease is the income engine of the asset. WALE quality, not just WALE length, determines whether income is genuinely durable or not. Every financial assumption in the acquisition model runs through the lease.

4. Building Condition Reports

What to check: Commission independent building condition reports from qualified consultants. Review for structural integrity, roof condition, mechanical and electrical services, facade, drainage, and any deferred maintenance or capital items not currently disclosed.

Red flag: Significant deferred maintenance the vendor hasn't disclosed, or capital expenditure items like roof replacement, lift refurbishment, HVAC,  due within the next five years that will fall to the landlord rather than the tenant.

Why it matters: Building condition reports are commonly skipped or replaced with a visual inspection, or just a standard residential building and pest inspection. This is how buyers inherit capital expenditure they didn't price into the acquisition. For any commercial asset,, independent building condition reports are not optional.

5. Environmental and Contamination Risk

What to check: Check the relevant state EPA register for any contamination notices or remediation orders. For industrial assets or any property with a history of manufacturing, fuel storage, or trade waste, further investigation may be warranted before exchange.

Red flag: Prior use as a dry cleaner, fuel station, mechanical workshop, or manufacturing site without a clean environmental audit on record. These uses commonly result in soil or groundwater contamination that transfers with ownership.

Why it matters: Environmental contamination liability transfers with ownership. Remediation costs can reach into the hundreds of thousands or millions and are not covered by standard property insurance. For industrial acquisitions, this is a non-negotiable due diligence item.

6. Flood Overlay

What to check: Review the relevant state flood mapping layer and council flood overlay maps. Confirm whether the property falls within flood zone. Check the current Certificate of Currency whether any flood insurance is held and whether it is transferable to a new owner.

Red flag: A medium or high-risk flood classification, or any property that has experienced inundation within the last 20 years. Flood risk in Australia has been materially re-rated following the 2022 flooding events - some properties previously classified as low risk or no risk have since been reclassified.

Why it matters: Flood risk affects insurability, lender appetite, and long term capital value. Some properties in high-risk zones are effectively uninsurable at commercially viable premiums. Vanta treats flood risk as a deal-level issue, not a negotiating variable.

7. Comparable Sales Evidence

What to check: Obtain recent comparable sales data from a registered valuer, a buyers agent, or a reputable data service. Compare the asking price to recent comparable transactions on a per square metre and yield basis, adjusted for differences in lease quality, location, and building condition.`

Red flag: An asking price that cannot be supported by recent comparable sales evidence within the same submarket, or a yield assumption that requires above-market rents or a tightening of cap rates with no fundamental justification.

Why it matters: Vendors set asking prices. Market value is determined by what comparable assets have actually transacted at. Paying above market value for a commercial property is not always a mistake, but it should be a deliberate decision with a clear rationale, not an oversight made in a compressed due diligence period.

8. Finance Pre-Approval and Lender Appetite

What to check: Obtain conditional finance approval from a commercial lender before submitting an offer. Confirm the lender's appetite for the specific asset class, location, and tenancy type. Not all commercial lenders will fund all asset classes - some exclude certain office tenancies, single-tenanted assets below a size threshold, or properties in secondary markets.

Red flag: A vendor requiring unconditional exchange before the buyer has confirmed lender appetite, or a lender willing to lend but at a significantly lower LVR than expected, materially affecting the required capital.

Why it matters: Due diligence periods in commercial property contracts are often compressed. Discovering that a lender won't finance a specific asset type two weeks before settlement is a serious problem. Lender appetite should be confirmed not assumed.

9. Strata Records (Where Applicable)

What to check: If the property is a strata or community title lot, obtain and review the owners corporation records. Check the sinking fund balance, any pending capital works on common property, outstanding special levies, by-law compliance issues, and any current or pending litigation involving the owners corporation.

Red flag: An underfunded sinking fund with significant common property capital works pending, or outstanding litigation that may result in a special levy being struck against all lot owners after settlement.

Why it matters: Special levies for common property works are a buyer's liability from the date of settlement. An underfunded sinking fund requiring a $150,000 special levy six months after settlement is not a vendor disclosure problem - it is a buyer's expense.

10. Contract Review and Settlement Conditions

What to check: Have a specialist commercial property solicitor review the contract of sale before exchange. Confirm the settlement period, any special conditions, adjustments for prepaid outgoings, the treatment of outstanding rent obligations, and the vendor's statutory disclosure requirements.

Red flag: Contracts that include unusual vendor protections, compress the due diligence period without justification, or contain non standard conditions that limit the buyer's ability to exit if material issues are identified during due diligence.

Why it matters: Commercial property contracts in Australia are not standardised in the same way residential contracts are. The due diligence period and special conditions are negotiated. Legal review before exchange is non-negotiable, not a cost to be deferred.

11. GST, Stamp Duty, and Acquisition Structure

What to check: Confirm whether the transaction is subject to GST, and whether a GST-free supply of a going concern can be structured where the property is tenanted. Seek advice from a commercial solicitor and accountant before exchange on stamp duty obligations, land tax, and the appropriate acquisition structure - individual, trust, company, SMSF or other.

Red flag: Proceeding to exchange without confirming the GST treatment or acquisition structure that cannot be unwound after settlement.

Why it matters: Getting the acquisition structure wrong is expensive to fix post-settlement. Rectifying it afterward is not straightforward and can trigger significant tax and compliance consequences, particularly within SMSF. See our lease vs buy analysis for more on SMSF commercial property considerations.

Why Buyers Use a Commercial Buyers Agent for This Process

Running commercial property due diligence requires coordinating a solicitor, building consultants, environmental consultant, valuer, and finance broker simultaneously, while also interpreting the results of each and forming a view on whether to proceed, negotiate, or exit. The coordination itself is not the hard part. The interpretation is.

Experienced buyers with multiple commercial transactions behind them sometimes manage this process themselves. First-time commercial buyers and business owners acquiring their first property are almost universally better served by engaging a commercial buyers agent to manage and interpret the process on their behalf. The cost of missing a material due diligence issue - in capital terms, legal terms, or operational terms - exceeds the advisory fee on any transaction in this asset class.

Vanta Advisory runs this framework on every acquisition we manage. We coordinate the due diligence process, interpret the findings, and provide a clear recommendation: proceed, negotiate, or exit. We also know when to walk away and we're not compensated if a transaction falls through, so our advice is always aligned with the right outcome.

Work With Vanta

Vanta Advisory is a buy-side commercial property advisory firm operating across Victoria, NSW, Queensland, South Australia, and Western Australia. We represent buyers in the $2.5M–$30M range across industrial, medical and allied health, large format retail, and small to mid-tier office assets.

If you are currently assessing a commercial property and want independent buy-side representation, contact a commercial buyers agent in Melbourne or a commercial buyers agent in Sydney to discuss your situation.

Our engagement fee is $5,000 + GST, rebated at settlement against our acquisition fee of 1.75%–2.5% + GST.