Commercial Real Estate Due Diligence Checklist

Due diligence is your last chance to uncover deal-breaking risks before closing. A thorough due diligence process takes 30–60 days and covers financial statements, legal documents, physical property conditions, market fundamentals, and operational contracts. This comprehensive checklist ensures you don't miss critical issues.

Read time: 14 minutes | Updated April 2026

What Is CRE Due Diligence?

Due diligence is the systematic investigation and verification of a property's financial performance, legal status, physical condition, market position, and operational structure. It's your opportunity to validate all seller claims, identify hidden liabilities, and confirm the deal thesis before committing capital.

Most acquisition agreements include a 30–60 day due diligence period with the option to terminate without penalty if you discover material issues. After that window closes, you're committed. Make every day count.

Financial Due Diligence Checklist

Rent Rolls & Lease Documentation

□ Current rent roll (all tenants, lease terms, rates, expiration dates)
□ Signed lease copies for all major tenants (top 80% of income)
□ Lease abstracts summarizing key terms, renewal options, escalations
□ Payment history for last 24 months (verify no payment defaults)
□ Tenant credit reports and financial statements
□ Tenant improvement (TI) commitments and completion dates
□ Estoppel certificates from all tenants (confirming lease terms)

Operating Statements & Tax Returns

□ 3 years of trailing twelve months (T12) operating statements
□ 3 years of property tax returns and actual tax bills
□ Accounts payable/receivable aging reports
□ Reconciliation of broker/seller pro forma to actual financials
□ Verification of unusual expenses or one-time charges
□ Owner's capital call history (if syndicated deal)

Debt & Financing

□ Current loan documents (promissory note, deed of trust)
□ Loan balance, interest rate, term, amortization period
□ Prepayment penalties, defeasance costs, yield maintenance
□ Lender consent requirements for sale or refinance
□ Lender's current DSCR and LTV calculations
□ Any loan defaults or covenant violations

Legal Due Diligence Checklist

Title & Ownership

□ Updated title commitment and preliminary title report
□ Title insurance commitment (standard coverage)
□ Deed and ownership chain (at least 5 years back)
□ Title exceptions and liens (mechanic's, tax, other)
□ Boundary survey (if available and current)

Zoning & Land Use

□ Zoning certificate or confirmation of current zoning
□ Current use compliance (legal non-conforming status, if any)
□ Master plan and comprehensive zoning documents
□ Variance history and any pending zoning challenges
□ HOA or CC&Rs affecting the property

Environmental & Phase Reports

□ Phase I Environmental Site Assessment (ESA) completed
□ Review for recognized environmental conditions (RECs)
□ Phase II (soil/groundwater testing) if Phase I identifies issues
□ Asbestos, lead paint, and mold surveys (if applicable)
□ Wetlands study (if property near water)

Litigation & Judgments

□ UCC search (uniform commercial code liens)
□ Judgment and lien searches
□ Pending or threatened litigation against property/seller
□ Seller's representation of pending claims

Physical Property Checklist

Property Condition & Inspection

□ Third-party property condition assessment (PCA)
□ Building systems inspection (HVAC, plumbing, electrical)
□ Roof inspection and remaining useful life (RUL) estimate
□ Parking lot condition and ADA compliance assessment
□ Deferred maintenance list and capital reserve estimates
□ Code compliance review (fire exits, ADA, seismic safety)

Utilities & Building Systems

□ Utility bills for last 3 years (electric, gas, water, sewer)
□ Utility account details and responsibility (owner vs. tenant)
□ HVAC maintenance records and service contracts
□ Boiler and pressure vessel certifications
□ Fire suppression and life safety systems compliance

Licenses & Permits

□ Current business license (if applicable)
□ Certificate of Occupancy (CO) or confirmation of valid use
□ Building permits for all renovations and upgrades
□ Inspection reports and sign-offs from city/county

Market & Operational Checklist

Market Analysis

□ Submarket vacancy rate and trends
□ Market rent for comparable properties
□ Cap rate ranges for similar assets in submarket
□ Supply pipeline (new construction, planned projects)
□ Employment trends and major employers
□ Population growth and demographic trends

Management & Service Contracts

□ Property management agreement and fees
□ Service contracts (maintenance, cleaning, security, etc.)
□ Vendor payment history and quality performance
□ Insurance certificates and coverage details
□ CAM reconciliation and expense allocation methodology

Insurance & Liability

□ Current property insurance policy and declarations page
□ Liability insurance and coverage limits
□ Workers' compensation insurance (if applicable)
□ Claims history for last 5 years
□ Lender insurance requirements and loss payee designations

Typical Due Diligence Timeline

Days 1–5: Document Request & Initial Review

Request all documents from seller's counsel. Begin preliminary review of offering memorandum, rent rolls, T12 statements.

Days 5–15: Financial & Legal Deep Dive

Review leases, verify rent roll accuracy, reconcile operating statements. Order title work, environmental reports, and property inspections.

Days 15–30: Physical & Market Review

Property inspections conducted. Phase I environmental completed. Market analysis underway. Tenant credit reports reviewed.

Days 30–45: Follow-Up & Underwriting

Follow up on any missing documents. Request estoppel certificates from tenants. Final underwriting and sensitivity analysis.

Days 45–60: Final Review & Decision

Resolve any outstanding items. Final investment committee sign-off. Proceed to closing or terminate with cause if issues discovered.

Critical Red Flags to Watch For

Financial Red Flags

⚠ Large discrepancy between broker's pro forma and actual T12 statements
⚠ Major tenant rent payment defaults or late payments
⚠ Rent rolls don't match actual lease files or payment records
⚠ DSCR below 1.20x (lender risk)
⚠ Significant one-time expenses normalized into ongoing operations

Legal Red Flags

⚠ Title defects or unresolved liens on property
⚠ Pending litigation against property or owner
⚠ Zoning non-compliance or pending code violations
⚠ Phase I environmental with recognized environmental conditions (RECs)
⚠ Loan covenant violations or default risk

Physical Red Flags

⚠ Extensive deferred maintenance or structural issues
⚠ Roof with very short remaining useful life (RUL < 5 years)
⚠ HVAC or major building systems failure imminent
⚠ ADA non-compliance or accessibility issues
⚠ Asbestos, lead paint, or mold discovered

Market & Operational Red Flags

⚠ High submarket vacancy or declining employment trends
⚠ Lease stacking risk (40%+ of income expiring in single year)
⚠ Major tenant considering relocation or bankruptcy risk
⚠ Poor management history or frequent management changes
⚠ Rents above market rates (rent adjustment risk on renewal)

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Frequently Asked Questions

How long does due diligence typically take? ▼

Most acquisition agreements include a 30–60 day due diligence period. For simple stabilized properties with clean financials, 30 days may suffice. For complex or value-add deals with tenant issues or deferred maintenance, 60 days is standard. You can negotiate extensions if needed, but have a clear deadline in the agreement.

Can you terminate a deal during due diligence? ▼

Yes, most agreements allow termination without penalty if you discover "material adverse conditions" during due diligence. This includes major structural issues, title defects, environmental contamination, lease fraud, or significant financial discrepancies. Always include this termination right in your agreement and document any issues discovered.

What's the most common issue found in due diligence? ▼

Rent roll discrepancies are extremely common. The seller's rent roll doesn't match actual payment records, or tenants dispute lease terms. Always verify rent roll data against signed lease copies and payment history. Another frequent issue: underestimated deferred maintenance discovered during property inspection.

Do you always need Phase I environmental? ▼

Yes, Phase I is standard due diligence for nearly all commercial properties. It's relatively inexpensive ($1,500–$3,000) and required by most lenders. If Phase I identifies recognized environmental conditions (RECs), you'll need Phase II (soil/groundwater testing), which is more costly. Budget for Phase I upfront.

Who pays for due diligence costs? ▼

The buyer typically pays for all due diligence costs (inspections, environmental, title work, appraisals, etc.). Budget $10,000–$50,000 depending on property size and complexity. These costs are non-refundable even if you terminate the deal. Negotiate with the seller to cover some costs or reduce the price to offset due diligence expenses.

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