Commercial Property Is Not Passive Income. Here Is the First Thing I Check Before Buying.

A client came to us with what looked like a bulletproof commercial deal. A petrol station in suburban Melbourne. Long lease. Net rental with tenant paying all outgoings. Yield above seven per cent. On paper, it was the perfect passive investment. In reality, it nearly cost him $600,000.

The problem was environmental contamination. Petrol stations carry fuel underground in storage tanks. Those tanks leak. Sometimes slowly, over decades. The contamination seeps into the soil and groundwater, and the cleanup — called remediation — can cost $300,000 to $600,000 or more. The tenant is responsible for operational contamination under the lease, but if the tenant's business fails and they walk away, guess who inherits the environmental liability? The landlord 1.

We did not need a soil test to raise the red flag. We did not need an environmental audit. We needed to do one thing first: look.

Looking is the most underrated due diligence tool in property investment. Not reading reports. Not running spreadsheets. Going to the physical location, standing there, and observing with your own eyes what the numbers and marketing materials will never tell you.

After more than 350 residential and commercial property transactions at Optima Real Estate, the first rule I teach every junior member of our team is this: before you open a spreadsheet, open the front door 2.

What "looking" actually means (it is not a casual drive-by)

When I say look, I do not mean glance at the property from the car window and tick a box. I mean structured observation — spending 30 to 60 minutes at and around the property, at different times, watching how it operates in the real world.

For commercial property, the things you need to observe are fundamentally different from residential. In residential, you are checking the building condition — roof, foundation, plumbing, electrics. In commercial, you are checking the business viability of the tenant. Because your rental income depends entirely on whether the tenant's business survives.

A residential tenant who loses their job still needs somewhere to live. A commercial tenant whose business fails has no reason to stay. They surrender the lease, you inherit an empty building with specialised fit-out that is useless to the next tenant, and your "passive income" becomes a very active problem.

This is why looking at the tenant's business is the single most important thing you can do before buying commercial property. The building is secondary. The tenant is everything 3.

How to look at a restaurant (the most common commercial trap)

Restaurants represent some of the highest-yielding commercial property in Melbourne. They also have the highest failure rate. Roughly 60 per cent of restaurants close within the first three years of operation. If your tenant is one of that 60 per cent, your high-yield investment becomes an empty shop with a grease trap and a commercial kitchen that the next tenant may not want 4.

Here is what I check when assessing a restaurant-tenanted property:

Customer volume. Visit during lunch and dinner service on different days. Count how many tables are occupied. A restaurant that is 70 per cent full during peak service is healthy. A restaurant that is 30 per cent full during a Friday dinner service is struggling. Do not visit once — visit three times at different times.

Google Reviews. Check the restaurant's Google rating and read the last 50 reviews. Look for patterns, not individual complaints. If multiple reviews mention slow service, cold food, or rude staff, the business is deteriorating. A restaurant with a rating below 3.5 stars and declining is a lease surrender waiting to happen.

Staff attitude. Walk in as a customer. Order something. Watch how the staff interact with each other and with customers. Engaged, energetic staff indicate a well-managed business. Disinterested, slow-moving staff indicate a business running on fumes.

Repeat customers. If you visit twice and see the same faces, the restaurant has a loyal customer base. Repeat customers are the backbone of restaurant profitability. A restaurant that relies entirely on foot traffic and new customers is volatile.

Cleanliness. This one is obvious but people miss it. A dirty restaurant is a restaurant cutting costs. If they are cutting costs on visible cleanliness, they are cutting costs on food quality and maintenance. The kitchen is worse than the dining room — you just cannot see it 5.

Fine dining restaurants are particularly risky in the current environment. Margins in fine dining are often below 20 per cent. A single bad month — a lockdown, a health scare, a negative review from a food critic — can tip the business into insolvency. I actively steer clients away from fine dining-tenanted commercial property unless the tenant has a decade-plus track record.

How to look at a warehouse (the hidden security risk)

Warehouses are marketed as low-maintenance, long-lease, set-and-forget investments. The tenant pays all outgoings. The building is simple — four walls and a roof. What could go wrong?

More than you think.

We inspected a warehouse in Melbourne's western suburbs last year. Good location, reasonable yield, ten-year lease with a logistics company. On paper, solid. When we drove to the site, the first thing we noticed was the access road. It was a dead-end lane shared with two other warehouses and bordered by scrubland on one side.

When we walked around the back of the building, there was a homeless person sleeping against the loading dock. The roller door had been forced open at some point and the damage was still visible. There were no security cameras, no motion-sensor lights, and no fencing along the rear boundary 6.

The tenant was storing inventory worth $2 million in a building with the security profile of a garden shed.

Here is why this matters to the landlord. If the tenant suffers repeated theft or break-ins, they will either demand the landlord improve security (at the landlord's cost if not specified in the lease), or they will relocate when the lease expires. Either outcome costs you money.

What I check when inspecting a warehouse:

Location and access. Is the warehouse on a main road or a back lane? Is it visible to passing traffic? Visibility deters break-ins. Isolated locations invite them.

Security infrastructure. Cameras, fencing, lighting, bollards, alarm systems. If the tenant has not invested in security, ask why. Either the area is safe enough not to need it (unlikely in outer-suburban industrial zones) or the tenant is cutting costs.

Neighbouring properties. Are the adjacent lots occupied and well-maintained? An empty lot next door with overgrown vegetation is a staging area for criminal activity. It also depresses the value of your property.

Loading dock condition. Check the roller doors, the dock levellers, and the concrete aprons. These are the most-used components of a warehouse and the most expensive to replace. A roller door replacement is $8,000 to $15,000. A dock leveller is $12,000 to $25,000.

Drainage. Walk the perimeter after rain. Industrial properties in low-lying areas are prone to stormwater flooding, which can destroy tenant inventory and trigger insurance claims that eventually increase your premiums.

The petrol station story (and what we learned)

Back to the petrol station.

Our client had been shown the property by a commercial agent who specialised in service station sales. The numbers looked excellent: $180,000 annual net rent, 15-year lease with a national fuel brand as tenant, all outgoings borne by the tenant. At an asking price of $2.4 million, the yield was 7.5 per cent.

Before we even opened the information memorandum, I drove to the site.

The first thing I noticed was the age of the forecourt. The concrete was cracked and stained. The fuel pump dispensers were older-generation models. The signage was faded. A neighbouring service station 400 metres down the road had recently been rebuilt with modern facilities, a convenience store twice the size, and electric vehicle charging stations.

The second thing I noticed was water. There was a persistent wet patch near the rear of the property that did not correlate with any visible drainage. In my experience, unexplained moisture at a service station site is a red flag for underground tank leakage 7.

The third thing I noticed was the traffic pattern. The site had ingress from one direction only, with no left-turn access from the main road during peak hours. The competing station 400 metres away had dual access from both directions. In fuel retailing, access is everything — customers will not make a U-turn to buy petrol.

I recommended against proceeding. The client pushed back — the yield was attractive and the lease was long. I asked him one question: "If the national brand decides not to renew this lease in 15 years because the competing station is newer, better-located, and offers EV charging, what is this property worth to you?"

The answer: a contaminated block of land with a remediation liability. Not $2.4 million. Potentially negative value.

The client did not proceed. Two years later, the property sold to another buyer at $2.1 million — $300,000 below the original asking price. The fuel brand subsequently announced it was reducing its number of company-operated sites and transitioning toward dealer-operated models. The new owner's "passive income" is about to become very active 8.

The commercial property observation checklist

I use a version of this checklist for every commercial property we assess. It is not exhaustive — each property type has unique risks — but it covers the universal factors.

Visit 1: Daytime, weekday

• Drive the surrounding area. Note competing businesses, vacancy rates in nearby shops, foot traffic volume.
• Observe the tenant's business in operation. Is it busy? Are staff engaged? Is the premises well-maintained?
• Check Google Reviews for the tenant's business. Note the rating, the review count, and the trend direction.
• Walk the property perimeter. Check for drainage issues, structural damage, security gaps, and boundary encroachments.
• Photograph everything. Front, sides, rear, neighbouring properties, the street, parking availability.

Visit 2: Evening or weekend

• Assess the property's security at night. Is the area well-lit? Are there security cameras? Is the property visible from the street?
• Check whether the tenant's business operates at this time. A restaurant that is closed on Friday evening is a warning sign. A warehouse district that is deserted at night creates theft risk.
• Note noise levels, traffic patterns, and the general feel of the area after dark.

Visit 3: Post-rain (if possible)

• Walk the perimeter again. Look for standing water, drainage problems, and unexplained moisture.
• Check the roof from outside for ponding or overflow. Flat-roofed commercial buildings are notorious for leaks.
• Inspect any loading docks or basement areas for water ingress [9].

These three visits take approximately four hours total. On a commercial investment of $1 million or more, four hours of observation is the cheapest insurance available.

The spreadsheets will tell you the yield. The lease will tell you the terms. But only your eyes will tell you whether the tenant's business is healthy, whether the building is secure, and whether the investment will actually deliver the returns the agent is promising.

Look first. Spreadsheet second. Always.