The Commercial Real Estate Due Diligence Checklist

Due diligence documents in commercial real estate fall into five categories. Not every acquisition requires every item; a single-tenant industrial asset will have a shorter lease file than a 200-unit retail centre, but the categories remain consistent across property types. Missing documents are themselves information: they signal gaps that require resolution before closing.

Title and Ownership Documents

• Preliminary title report. Issued by a title company, this lists all recorded encumbrances, easements, covenants, and liens against the property. The final title policy is the most important closing deliverable, but the preliminary report defines the diligence scope and identifies items requiring clearance.

• ALTA/NSPS land title survey. The American Land Title Association / National Society of Professional Surveyors (ALTA/NSPS) survey maps the legal boundaries, improvements, easements, and access rights of the site. Discrepancies between the survey and the title report, or between the survey and lease premises descriptions, must be resolved before closing.

• Deed and chain of title. Confirms the ownership history and identifies any breaks or disputes in the record of title.

• Recorded easements and encumbrances. Utility easements, access agreements, and restrictive covenants that survive transfer and may affect the property's usability or financing terms.

• Zoning certification and land use approvals. Confirms that the property's current use is legally permitted and that no outstanding violations exist. Non-conforming use status, where a property pre-dates current zoning, requires particular attention from counsel.

• Existing title insurance policies. Review of prior owner policies can accelerate current-cycle underwriting and surface prior claims or exceptions not resolved in earlier transactions.

Environmental Due Diligence Documents

• Phase I Environmental Site Assessment (Phase I ESA). A Phase I ESA is a desktop and site-inspection study identifying Recognised Environmental Conditions (RECs), meaning evidence or likelihood of past or present contamination, without soil or groundwater sampling. It is required by lenders and considered standard practice for any commercial acquisition.

• Phase II Environmental Site Assessment. Required when a Phase I ESA identifies RECs. Involves physical sampling to quantify contamination levels and determine remediation scope and cost. A Phase II that yields a no-further-action letter from the relevant regulator substantially de-risks the acquisition.

• Asbestos and lead-based paint surveys. Required for buildings constructed before 1980 in most jurisdictions. Identifies whether hazardous materials are present, in what condition, and whether abatement or ongoing management obligations apply.

• Environmental remediation records and regulatory correspondence. If prior remediation has occurred, all agency correspondence, no-further-action letters, and monitoring plans should be in the data room. Incomplete remediation histories are a common deal complication.

Lease and Tenancy Documents

Lease review is typically the most labour-intensive part of a CRE acquisition. Each lease is its own negotiated contract; the income an asset actually generates depends on the precise terms of each agreement, not the summary in the offering memorandum. For a primer on how AI is changing this category of work, see our guide to AI in real estate.

• Signed lease agreements and all amendments. The operative documents. Any amendment, side letter, or addendum can modify rent, term, permitted use, or termination rights. Missing amendments are among the most common data room deficiencies and frequently indicate discrepancies between the rent roll and actual lease terms.

• Lease abstracts. Structured summaries of each lease's key commercial terms: base rent schedule, term, options to renew or terminate, permitted use, assignment and subletting provisions, and rent abatement periods. Abstracts should be verified against the executed leases — they are working documents, not authoritative sources.

• Rent roll. A current snapshot of all tenants, occupied premises, contractual rents, lease expiration dates, and any pending rent abatements or free-rent periods. The rent roll is the primary financial summary of the asset's income; verifying it against the signed lease agreements is the core of tenancy review.

• Weighted average lease term (WALT). WALT is the income-weighted average of remaining lease terms across all tenants. A high WALT indicates durable cash flow; a low WALT signals near-term re-leasing risk that should be reflected in underwriting assumptions and cap rate selection.

• Common area maintenance (CAM) reconciliations. CAM is the mechanism by which tenants reimburse landlords for shared operating expenses. CAM provisions vary significantly between leases, and reconciliation records confirm whether tenants have been billed correctly and whether any disputes are outstanding or likely.

• Tenant estoppel certificates. Signed by each tenant, estoppels confirm the key terms of each lease and certify that no defaults, rent credits, or side agreements exist outside the lease documents. Lenders typically require estoppels from tenants representing a threshold percentage of gross income before advancing funds.

• Subordination, non-disturbance, and attornment agreements (SNDAs). SNDAs govern the relationship between tenants and any lender holding a mortgage on the property. Institutional tenants often require SNDAs as a condition of signing a new lease.

• Guarantees. Personal, corporate, or letter-of-credit guarantees attached to individual leases. The enforceability of a guarantee depends on the creditworthiness of the guarantor, which should be separately verified.

• Co-tenancy and exclusivity clauses. Retail leases frequently include co-tenancy rights, permitting rent reductions or early termination if an anchor tenant leaves, and exclusivity provisions, restricting the landlord from leasing to competitors of the protected tenant. These clauses can materially affect income stability and future leasing flexibility.

Financial and Operating Documents

• Three to five years of audited operating statements. Actual income and expenses over multiple cycles, not pro forma projections. The spread between in-place income and underwritten income is a reliable signal of seller optimism; material differences require explanation before acceptance.

• Current-year budget and variance report. Shows where actual performance is tracking against the current budget and identifies material unfavourable variances in operating expense categories that warrant follow-up.

• Capital expenditure history. Documents what has been spent on capital projects over the past three to five years and what remains deferred. Deferred capital is a standard pricing negotiation lever.

• Property management agreement. Fee structure, term, notice provisions, and any management company obligations that transfer to the buyer at closing.

• Service and vendor contracts. HVAC maintenance, lift service, landscaping, security, and other contracts that run with the property. Contracts with unfavourable termination provisions may increase operating costs post-acquisition.

• Utility bills and meter records. Confirms actual consumption patterns and identifies any utilities not separately metered or sub-metered to tenants, which represent a landlord cost exposure.

• Insurance policies and claims history. Current property and liability insurance, plus any claims filed in the past three years. A pattern of repeated claims may indicate maintenance or structural issues.

Physical and Structural Documents

• Property condition assessment (PCA). An independent engineer's report on the condition of the building systems and structure, typically including a ten-year capital expenditure reserve estimate. The PCA quantifies deferred maintenance and major system replacement costs.

• Building plans and specifications. As-built drawings for the structure and mechanical, electrical, and plumbing systems. Required for lender underwriting and useful for estimating fit-out or repositioning costs.

• Certificate of occupancy. Confirms the building is legally permitted for its current use. Missing or expired certificates can delay or prevent financing.

• Outstanding permits, violations, and open inspections. Any unresolved code enforcement matters or building department violations carry over to the buyer. A title search typically captures recorded violations, but municipal databases should also be checked directly.

• Lift and elevator inspection certificates. Current compliance documentation for any vertical transportation equipment, typically required annually in most jurisdictions.

• Roof inspection reports. Condition assessment and estimated remaining useful life. Roof replacement is frequently the largest single capital item in a property condition assessment.

How the CRE Due Diligence Process Works

Institutional acquisition teams rarely review all document categories simultaneously. The process is typically phased to manage cost and prioritise potential deal-killers before committing to full review. For a broader view of how AI is changing due diligence across asset classes, see our article on AI due diligence.

Phase 1: Pre-LOI Preliminary Review

Before a letter of intent is submitted, the acquisition team reviews the offering memorandum, the rent roll, and any financial information provided by the seller's broker. The goal is to confirm whether the asset warrants deeper investigation and to identify obvious deal-killers: a significant environmental liability, a co-tenancy clause that could collapse the income, or title encumbrances that would prevent financing. This phase relies on broker-provided summaries and publicly available information, not a formal data room.

Phase 2: Full Data Room Review

Following an executed letter of intent and negotiated diligence access, the full data room opens. The team works systematically through each document category, assigning specialists to their areas: environmental consultants for Phase I ESA review, counsel for title and lease analysis, engineers for the property condition assessment. The rent roll is verified against signed lease agreements and discrepancies are logged as open items requiring resolution before closing. Most acquisition timelines allow 30 to 60 days for full data room review, though competitive processes compress this window considerably. A well-organised data room, structured by document category with consistent naming conventions and all amendments filed alongside the primary lease, materially accelerates this phase; disorganised data rooms add days to the timeline regardless of team capacity.

Phase 3: Exception Resolution and Price Adjustment

Diligence findings feed directly into deal negotiation. Environmental RECs may result in escrow holdbacks or seller remediation obligations. Lease document gaps, including unsigned amendments, missing estoppels, and undisclosed side letters, affect the certainty of projected income and can support price adjustments or additional representations and warranties in the purchase agreement. Capital deficiencies identified in the property condition assessment are similarly quantifiable and negotiable. The final step is confirming that all open items are resolved or addressed contractually before the due diligence period expires.