What Due Diligence Checklist Should I Use Before Closing a CRE Deal?

Due diligence is the systematic process of verifying that a CRE property is what you think it is—physically, financially, and legally. It's the last line of defense before you write the check. A robust due diligence process catches problems (bad tenants, environmental contamination, structural defects, overstated revenues) that could cost 10–50% of your investment if discovered post-closing. The best investors view due diligence as a 60–90 day process, not a 2-week box-check.

Due Diligence Timeline and Phases

Most CRE deals follow this timeline. Days 1–30: Initial underwriting (property, market, financial assumptions). Days 15–45: Financial and legal review (leases, contracts, title, environmental). Days 20–60: Property condition review (building systems, structure, deferred maintenance). Days 45–75: Tenant and lender final approval (tenant verification, loan approval). Days 75–90: Final walk-through and closing (confirm no material changes, execute documents).

Phase 1: Initial Underwriting (Days 1–30)

Financial documents: Get operating statements (3 years); compare to tax returns (more reliable). Obtain all tenant leases; verify rents, renewal terms, expiry dates. Get lease rollover schedule showing when key tenants expire. Review rent roll (current occupied units, rent per unit, tenant names, lease expiry). Request capital improvement or deferred maintenance list. Pull utility bills (12 months); verify expense assumptions. Verify property tax bill and note any pending assessments. Review insurance declarations page. Review management company agreement.

Red flags: Operating statements show NOI 20%+ higher than tax returns (indicates fictional expenses or overstated revenues). Recent tenant defaults or non-renewals not mentioned. Key lease expiries clustered in specific years (tenant concentration risk). Property tax assessed significantly below market value (suggests recent change pending).

Phase 2: Financial & Legal Deep Dive (Days 15–45)

Tenant review: Get physical lease copies; verify lease terms (tenant entity, rent amount and escalation, commencement and expiry, renewal options, build-out allowances, default provisions, assignment/subletting terms). Conduct credit review (Dun and Bradstreet report for corporate tenants, credit check for smaller tenants, recent financials if available, payment history). Verify special provisions (exclusivity clauses, right of first refusal, personal guarantees, subordination agreements).

Legal review: Get title insurance commitment; verify no liens, easements, or encumbrances. Get UCC search; verify no blanket liens on personal property. Review any HOA or common area covenants; confirm mandatory fees or restrictions. Check litigation history (county court records). Verify building permits and certificate of occupancy. Confirm current zoning matches stated use. Review easements and access issues. Confirm regulatory compliance (ADA, fire safety, building code).

Phase 3: Property Condition & Environmental (Days 20–60)

Property inspection: Hire professional architect or engineer; get report in 15–20 days. Review structural condition (foundation, framing, load-bearing walls). Assess roof age, condition, remaining useful life. Evaluate HVAC systems, electrical, plumbing. Check ADA accessibility and compliance. Review fire safety (sprinkler system, fire exits, alarm system). Inspect building envelope (facade, windows, waterproofing). Review common areas (elevators, hallways, restrooms). Create deferred maintenance list identifying all capital repairs needed in next 5–10 years.

Red flags: Roof age 20+ years (needs replacement soon, 50–150 thousand dollars). Structural cracks or water damage (costly repair). HVAC systems original (likely 20+ years, replacement needed, 50–200 thousand dollars). Electrical system inadequate (no capacity for upgrades). ADA non-compliance (costly remediation, liability).

Environmental Phase I (ESA): Phase I is non-negotiable for all commercial properties. Environmental consultant reviews property history, regulatory records, and conducts onsite inspection. Phase I identifies Recognized Environmental Conditions (RECs): uses or conditions suggesting contamination risk. If Phase I identifies likely REC (previous dry cleaner, gas station, industrial use), order Phase II to quantify risk. Phase II involves soil and groundwater sampling; estimated cleanup costs are provided. If Phase II shows contamination requiring 500,000+ dollars cleanup, this is deal-killing liability.

Phase 4: Tenant & Lender Final Review (Days 45–75)

Tenant verification: Call each tenant directly; confirm they occupy and rent is current. Verify lease terms with tenant; ensure they understand rent amount, renewal terms. Discuss tenant intentions (planning to renew, expand, move, sublet?). Review payment history; any disputes? Assess tenant quality (on-time payment, minimal complaints, good stewardship).

Lender approval: Get property appraised by lender's appraiser; report delivered in 15–20 days. Review appraisal; does it come in at or above purchase price? If below, may trigger renegotiation. Get final title report; verify all exceptions are acceptable. Get lender approval on environmental and title reports. Get insurance commitment confirming property is insurable at required coverage levels. Get zoning verification letter if required. Get lender's final underwriting approval (conditional or unconditional).

Red Flags That Should Kill the Deal

In any of these cases, either renegotiate the purchase price downward significantly (25%+) to compensate for risk, or walk away.

Bottom line: Due diligence is not a checklist to rush through; it's the foundation of your deal's success. Allocate 60–90 days and 20–50 thousand dollars in professional fees (inspector, environmental, attorney, CPA). The cost is 0.5–1% of deal value but saves 10–50% in post-closing surprises. Don't let deal pressure override standard protections. A deal requiring you to skip due diligence is not a good deal.