Acquisition Due Diligence: What to Demand From a Building Before You Close

Most buyers negotiate price. Few negotiate operating risk.

Financial due diligence on a commercial acquisition is thorough by default — cap rates, rent rolls, T12 statements, vacancy analysis. Mechanical and energy due diligence is usually an afterthought. A Phase I environmental gets ordered. Someone walks the roof. The HVAC gets a glance.

That gap is where post-acquisition regret is born.

A building’s systems don’t disclose their problems during a showing. They reveal them in the first operating season — in utility bills that don’t match the proforma, in tenant complaints that start immediately, in capital surprises that weren’t in the underwriting. By then, you’ve closed. You own it.

This is not about being cautious. It’s about knowing what you’re actually buying.

1) You can negotiate price. You can’t negotiate your way out of inherited operating problems.

A cap rate is a snapshot. What it doesn’t capture is the operational drift that’s been accumulating for years — systems that were installed but never properly commissioned, controls that were programmed to avoid complaints rather than minimize cost, maintenance deferred because the previous owner was already planning to sell.

None of that shows up in the rent roll. All of it shows up in your first year of ownership.

The mechanical and energy condition of a building is as material to its value as its occupancy. Treat it that way before you close, not after.

2) What you’re actually buying when you buy HVAC

Equipment age matters, but it’s not the most important number. A 12-year-old system that was properly commissioned and maintained can outperform a 3-year-old system that was never tuned.

What you’re really buying is a set of operating decisions embedded in the controls. Those decisions determine:

· How much energy the building consumes at full load — and more importantly, at part load (where buildings spend most of their hours)

· How responsive the system is to occupancy changes, seasonal transitions, and tenant mix shifts

· How much operator intervention is required to keep tenants comfortable

· What the failure modes look like — and how quickly they escalate

A building with good equipment and poor sequences is an operating liability. A building with aging equipment and solid controls documentation at least lets you plan.

“Installed doesn’t mean working. Commissioned doesn’t mean performing. The question isn’t what was put in — it’s what the building is actually doing right now.”

3) The five things to demand before you close

These are not nice-to-haves. They are the difference between underwriting a building and guessing at one.

Utility data — at least 24 months, by meter.

Not summarized. Not normalized. Raw bills and interval data if available. You want to see actual consumption patterns: how does the building behave in January versus July, at full occupancy versus partial, on weekdays versus weekends. Anomalies in utility data tell you more than any equipment inspection.

Sequences of Operation — the current, as-programmed version.

Not the design documents from the original project. What is actually running in the controls today. If the seller can’t produce this, assume the building is operating on improvised logic. That is a capital risk, not a maintenance issue.

Commissioning records — original and any subsequent.

Was the building formally commissioned at startup? Has there been any recommissioning or retro-commissioning since? Commissioning records tell you whether the system was ever verified to perform as designed — and whether anyone has checked since.

Deferred maintenance log and capital replacement history.

What has been deferred, and for how long. What has been replaced, and why. A building with no documented capital history either had perfect equipment (unlikely) or a seller who wasn’t tracking (common). Both have implications for what you’re walking into.

GHG and energy benchmark data.

If the building is subject to any disclosure requirements, get the benchmarking reports. If it isn’t, ask for an ENERGY STAR score or equivalent. Carbon pricing is real. Building performance standards are expanding. The energy intensity of the asset you’re acquiring will affect its operating cost trajectory and its refinancing options over the next decade.

4) Where most acquisition reviews fall short

A standard property condition assessment (PCA) tells you what exists and its approximate remaining useful life. That’s useful for capital planning. It doesn’t tell you whether the systems are performing.

There’s a meaningful difference between:

· “The AHU is 8 years old and has 12 years of remaining life” — a PCA finding

· “The AHU is running at constant airflow regardless of occupancy, driving $40,000 of annual excess fan energy” — an operational finding

The first goes into a capital reserve schedule. The second changes your underwriting.

What bridges that gap is a targeted operational review — someone who can read the BAS trends, interpret the utility patterns, and tell you not just what’s there but how it’s behaving. That service exists. It’s not standard in most acquisition processes. It should be.

5) The GHG question is now a financing question

Carbon pricing and building performance standards are no longer distant policy concepts. They are balance sheet items.

If you’re acquiring a building with high energy intensity — older heating plant, poor envelope, no controls upgrade in a decade — you are acquiring a future capital obligation. The question is whether that obligation is priced into the deal.

For buildings seeking CMHC-insured financing or refinancing under programs like MLI Select, energy performance now directly affects the terms available to you. A building that qualifies for energy efficiency tiers gets meaningfully better financing — lower premiums, longer amortization, higher LTV. A building that doesn’t may be stranded from programs that are becoming the financing mainstream.

Before you close, you want to know where this asset sits on that spectrum — and what it would cost to move it.

6) The conversation to have with your advisor

If you’re working with a building consultant on an acquisition, ask them these questions directly:

· What is the current energy use intensity (EUI) of this building, and how does it compare to its building type benchmark?

· Are the sequences of operation documented and current?

· When was this building last commissioned or recommissioned?

· What capital is deferred, and what does that cost look like in years one through five?

· What would it take to qualify this building for CMHC MLI Select energy tiers if applicable?

· What is the GHG exposure — current and under projected carbon pricing in years five and ten?

If those questions get vague answers, that’s information. It tells you what you’re walking into.

7) What capable acquirers do differently

The most sophisticated buyers in commercial real estate don’t just do financial due diligence. They treat the mechanical and energy condition of the asset with the same rigor they apply to the rent roll. They commission a targeted operational review alongside the standard PCA. They ask for utility data before they sign the PSA. They read the sequences of operation — or hire someone who can.

They do this not because they’re cautious. They do it because they understand that the price negotiated at closing is only part of the acquisition cost. The systems you inherit determine what the building costs to operate for the next decade.

That number is negotiable — but only before you close.

“The best time to find out what a building’s systems actually do is before you own them. The second-best time is the first winter.”

8) Before you proceed — a practical checklist

· 24 months of utility data requested and reviewed

· Current as-programmed sequences of operation obtained

· Commissioning records reviewed (original and subsequent)

· Deferred maintenance log and capital history obtained

· GHG benchmark data and energy intensity assessed

· Operational review commissioned alongside standard PCA

· Carbon pricing exposure modeled over 5 and 10 years

· CMHC financing eligibility assessed if applicable

9) The point

Due diligence tells you what you’re buying. Most buyers focus that attention on the financial picture. The buildings that surprise new owners in year one are almost always mechanical surprises — systems that looked fine in a walkthrough and behaved very differently under real operating conditions.

You can negotiate price. You can negotiate terms. What you can’t negotiate after closing is the operating reality of the asset you just acquired.

Know it before you close. Or pay to learn it afterward.

Ready to know what a building is actually doing before you close?

Optibuild Consulting works with building owners and acquirers to understand what a building is actually doing — not just what it was designed to do. If you’re in due diligence on a commercial acquisition and want an operational review alongside your standard PCA, let’s talk.