What Is Due Diligence in CRE Investing?

Legal due diligence runs alongside financial and physical review, and it starts with a title search confirming the seller actually holds clear ownership and identifying any liens, easements, or encumbrances that survive closing. Buyers order a title commitment from an insurer, review the underlying exceptions listed in the report, and negotiate with the seller over which items must be cleared before closing versus which are acceptable to accept as-is.

Counsel also reviews the zoning compliance letter, any existing service contracts, leases, and loan documents being assumed, and litigation history tied to the property. A property with pending litigation, unresolved code violations, or a zoning nonconformity can still close, but usually only with price adjustments, escrow holdbacks, or seller indemnification built into the purchase agreement.

Surveys deserve particular attention in this review, since an outdated survey can miss a fence encroachment, a utility easement never recorded, or a boundary line dispute with a neighboring parcel, any of which can delay closing or require a post-closing endorsement to the title policy. Buyers acquiring property in a state with looser survey requirements should budget extra time for this step rather than assuming the existing survey on file is current.

Rather than accepting a seller's trailing operating statement at face value, buyers rebuild the numbers from source documents: bank statements, individual tenant leases, utility bills, and tax bills, comparing them line by line against what the seller reported. This process routinely uncovers overstated income, such as concessions not reflected in advertised rents, or understated expenses, such as deferred maintenance charged to a future period.

Buyers also stress-test the pro forma assumptions driving their offer, checking market rent comps, expected turnover, and renovation cost estimates against recent comparable transactions rather than relying solely on the seller's or broker's projections.

For retail and office properties, financial due diligence also includes a common area maintenance reconciliation, checking whether the seller has billed tenants correctly for their share of shared expenses over the past several years. An underbilled CAM pool can mean the buyer inherits an obligation to true up charges retroactively, while an overbilled pool can create tenant disputes or refund claims shortly after closing.

For example, a buyer's financial due diligence on a 40-unit apartment building under contract for $6,000,000 uncovers that five units have been receiving unreported rent concessions worth $200 per month, meaning in-place income is roughly $12,000 lower annually than the seller's operating statement showed.

At the deal's underwritten cap rate of 6%, that income gap alone reduces supportable value by roughly $200,000. Combined with a property condition report flagging $150,000 in deferred roof and HVAC repairs, the buyer renegotiates the purchase price down to $5,650,000 before proceeding to closing.

This kind of repricing is one of the most common outcomes of a thorough due diligence process, and it is why experienced buyers build renegotiation room into their initial offer rather than bidding at the very top of what the unverified numbers appear to support.

The seller in this scenario initially resists the full price reduction, offering instead to escrow $200,000 pending completion of the environmental follow-up testing. The buyer's counsel ultimately negotiates a hybrid resolution: a $150,000 direct price reduction for the roof and HVAC items, plus a $100,000 escrow held for six months pending the environmental Phase II results, illustrating how due diligence findings often resolve through a mix of price adjustment and escrow rather than a single mechanism.

Physical and environmental review protects buyers from inheriting costly, hidden conditions.

Findings from any of these reports commonly become negotiation points, whether through a price reduction, a seller-funded escrow for remediation, or a change in the buyer's renovation budget.

Rent roll accuracy gets close attention, but lease abstracts, specifically renewal options, exclusive use clauses, and co-tenancy provisions in retail leases, often receive less scrutiny than they deserve. A single anchor tenant's kick-out right tied to occupancy levels elsewhere in a shopping center can materially change a deal's risk profile.

Buyers also sometimes underweight service contract terms, such as long-term equipment leases or exclusive vendor agreements that transfer with the property and cannot be easily cancelled, along with insurance claims history that can signal recurring physical problems not obvious from a single site visit.

Insurance loss run history, typically covering the trailing three to five years, is another document worth requesting directly rather than relying on the seller's summary, since a pattern of water damage or liability claims can signal a maintenance issue the seller has not disclosed and can also affect the buyer's own insurance premiums going forward.