Published by Acre Commercial | October 2026 | Spokane, WA

Estimated read time: 7 minutes | Category: Deal Process

A signed purchase agreement does not mean a commercial deal is done. It only means the clock has started. Most contracts give the buyer a set window to inspect the property. In that time, the buyer pulls records and checks that the deal still makes sense. This window is called due diligence. How a buyer uses it often decides whether the deal closes smoothly. Or it can fall apart at the worst possible moment.

How Long Is the Due Diligence Period?

The length of this window can change. Some deals move fast, with a tight 30-day period. Others stretch past 60 or even 90 days. That is common on larger or more complex properties.

A 45-day window is a typical middle ground for many deals in Eastern Washington and North Idaho. Still, the right number always depends on the property. What matters more than the exact figure is what happens inside it.

What Actually Happens During Due Diligence?

Once the contract is signed, the seller usually hands over a due diligence package. This often includes old surveys, title reports, environmental studies, service contracts, and copies of any leases in place. The buyer reviews those papers. Then the buyer hires its own outside experts to check the same facts firsthand.

This step matters because a listing description is not a promise backed by law. Square footage, income figures, and building condition all need a second look. A buyer who skips this step is trusting the seller’s word on a decision worth a lot of money. Sometimes it is hundreds of thousands of dollars. Sometimes it is millions. Diligence turns that trust into proof.

The First Checks Every Commercial Buyer Should Make

Title Review and Survey Work Come First

Most buyers start with the title report. It shows who legally owns the property. It also shows any claims, liens, or easements attached to it. A neighbor’s right to cross the land, an old utility easement, or an unpaid lien can all limit what a buyer can do with the site later.

A survey usually comes next. It confirms the property’s exact edges. It also flags any encroachments and maps existing buildings against the legal description on file.

Picture a warehouse in Spokane Valley or a retail pad in Post Falls. A boundary problem found after closing costs far more to fix than one caught during diligence.

The Phase I Environmental Site Assessment

Environmental risk sinks more commercial deals than almost anything else. A Phase I Environmental Site Assessment checks a site’s history. It follows a set industry standard known as ASTM E1527-21. The report looks at old land uses, regulatory records, and nearby sites. It flags what the industry calls recognized environmental conditions.

This step does not involve digging or testing soil. It is a paper and records review.

If the Phase I report raises a flag, the next step is a Phase II. That step does involve soil and groundwater samples. A Phase I report that meets EPA standards also protects a buyer’s legal defense down the road. In plain terms, it can shield a new owner from paying for pollution that existed before the sale.

For older industrial buildings across Spokane and Coeur d’Alene, this step is rarely optional.

Lease Review and Tenant Estoppel Certificates

If the property already has tenants, diligence shifts toward them. The buyer checks every lease for rent amounts, renewal rights, and any duties the new owner takes on. Rent rolls get checked line by line against real bank deposits, not just numbers on a page.

Lenders often ask for signed tenant estoppel letters before they will fund the loan. An estoppel is a short statement from the tenant. It confirms the lease terms, the current rent, and that the landlord has not broken any promises.

This one document protects both the buyer and the lender from a seller who oversold a lease.

Zoning, Financing, and the Physical Inspection

A few more items round out most due diligence lists. Zoning checks confirm the property can legally be used the way the buyer plans. This matters most for anyone who wants to redevelop a site or change how a building gets used.

A financing contingency gives the buyer a way out if the loan falls through on fair terms. A physical inspection covers the roof, the mechanical systems, and the building’s bones.

None of these checks happen alone. A single zoning limit can change how a buyer values everything else in the deal.

What Happens When the Due Diligence Clock Runs Out?

Every due diligence window ends on a set date. That date matters a great deal. Before it arrives, most contracts let the buyer walk away and get the deposit back. Some contracts allow this for any reason. Others require a real, documented problem. It depends on how the contract reads.

Once the deadline passes, the deposit usually “goes hard.” That means it stops being refundable, even if the buyer gets cold feet later.

Can You Extend the Due Diligence Period?

If a buyer needs more time, an extension is often possible. It usually comes at a cost. Sellers often ask for an extra deposit in return for pushing the date back.

That is one more reason to start early. Do not wait until the final week to order reports.

Frequently Asked Questions About Commercial Due Diligence

How long is a typical due diligence period in a commercial real estate deal?

There is no fixed length required by law. Simple deals sometimes use 30 days. Complex properties can run 60 to 90 days. A 45-day window is common across many Eastern Washington and North Idaho deals.

It leaves enough time for title, survey, and environmental checks without stalling the deal. The right length depends on the property type, its size, and how fast reports can actually get ordered and returned.

What is a Phase I Environmental Site Assessment?

A Phase I Environmental Site Assessment is a records-based check of a property’s past. It looks at old land uses, past filings, and nearby sites for signs of pollution, following the ASTM E1527-21 standard.

No soil or water testing happens at this stage. If the report flags a risk, the next step is a Phase II. That step does involve sampling.

What does it mean when earnest money goes hard?

Earnest money “going hard” means the deposit stops being refundable to the buyer. This usually happens once the due diligence period ends.

Before that date, many contracts let the buyer cancel and get the money back. After it, the buyer usually loses the deposit if they walk away without a valid reason under the contract.

Can a buyer extend the due diligence period?

Often, yes. It depends on what the contract allows and whether the seller agrees. Extensions are common when a report runs late or a new issue turns up.

Sellers often ask for an extra, non-refundable deposit in return for the extra time. Build a realistic timeline from day one. Do not assume more days will be easy to get later.

How Acre Commercial Helps Buyers Navigate Due Diligence

Acre Commercial works with investors, business owners, and developers across Spokane, Spokane Valley, Kennewick, Post Falls, and Rathdrum. We help buyers set a real due diligence timeline and coordinate with title companies, surveyors, and environmental firms. Problems get flagged early enough to negotiate, rather than scramble at the deadline.

Local market knowledge helps here too. Some submarkets carry older industrial stock with a higher chance of environmental flags. Some zoning offices move faster on checks than others. Knowing that can shave real time off a deal. Acre Commercial brings that knowledge to every deal it touches.

If you are getting ready to buy commercial property in the Inland Northwest, talk with us before you sign the purchase agreement.

Contact Acre Commercial: 43560.com

Make Every Day of Due Diligence Count

Due diligence gives a buyer one real chance to make sure the property in front of them matches the deal they thought they were making. Buyers who treat the clock as a working tool close with fewer surprises. They also stand on stronger ground if something still needs to be worked out.

Start early. Order reports the day the contract gets signed. Use every day of the window you asked for.