Commercial Real Estate Due Diligence Checklist (Beginner Guide)
A step-by-step CRE due diligence checklist: financials, leases, inspections, environmental, zoning, and common beginner mistakes to avoid before closing.
Due Diligence: What It Really Is
Due diligence is the process of verifying:
the property makes the money you think it makes
the building is in the condition you think it is
the leases and legal status are what you think they are
there aren’t hidden liabilities (environmental, zoning, compliance)
Beginners don’t lose money because they can’t find deals.
They lose money because they don’t verify reality before closing.
The Due Diligence Timeline (Beginner Roadmap)
Typical flow after LOI acceptance:
Collect documents (seller deliverables)
Financial verification
Lease review + tenant confirmations
Physical inspections
Environmental + zoning
Insurance + financing finalization
Re-trade or proceed
Close
Category 1: Financial Due Diligence (Verify the Money)
Must-have documents
T-12 (trailing 12 months income/expenses)
rent roll (current)
bank statements / deposit records (validate collections)
tax bills (current and historical)
insurance claims history (if available)
utility bills (if landlord-paid)
service contracts + invoices (snow, landscaping, trash, etc.)
Beginner verification steps
Compare rent roll to actual deposits
Verify delinquency/bad debt
Normalize expenses to “post-sale likely”:
taxes may reassess
insurance may reprice
deferred maintenance may become real
Category 2: Lease Due Diligence (The Asset Is the Lease)
Collect:
all leases + amendments
abstracts (summaries)
tenant ledger (payment history)
security deposit records
Review:
lease type (gross/modified/NNN)
reimbursements and caps
renewal options and rent escalations
maintenance responsibilities
exclusives, co-tenancy (retail)
assignment/subletting rules
Tenant estoppels (high value step)
An estoppel is a tenant-signed confirmation of key terms:
rent amount
lease dates
deposits
landlord obligations
claims/disputes
Beginner tip: prioritize estoppels for major tenants or high-risk lease situations.
Category 3: Physical Due Diligence (Inspect What You’re Buying)
Common inspections:
general building inspection / property condition assessment (PCA)
roof inspection
HVAC/MEP (mechanical, electrical, plumbing) review
parking lot and drainage
ADA considerations (as applicable)
fire/life safety systems
Blend-specific watch-outs
Retail: roof, façade, parking, signage, water intrusion
Industrial: slab condition, electrical capacity, loading, environmental history
Mixed-use: code compliance, separation of systems, old wiring/plumbing
Multifamily: boilers, plumbing stacks, unit turns and hidden damage
Category 4: Environmental Due Diligence (Don’t Skip This)
Most CRE deals require:
Phase I ESA (environmental site assessment)
If Phase I flags concerns, you may need:
Phase II testing (samples)
remediation plans (if necessary)
Beginner note: environmental issues can create long-term liability. Treat this seriously.
Category 5: Zoning, Legal, and Compliance
Verify:
zoning compliance for current use
certificates of occupancy (if applicable)
open permits or violations
survey (boundaries, easements, encroachments)
title commitment + exceptions
access rights and parking rights
Category 6: Insurance and Risk
Before closing:
get insurance quotes early (do not wait)
understand exclusions (flood, wind, older systems)
evaluate required coverage from lender
Beginner pitfall: “insurance sticker shock” late in diligence can kill deals.
Category 7: Financing (Make Sure the Loan Matches Reality)
Confirm lender requirements:
DSCR
appraisal
environmental
borrower liquidity / net worth
tenant concentrations (commercial)
rent roll stability
Make sure your underwriting assumptions match lender underwriting assumptions.
The “Re-Trade” (When You Renegotiate)
If diligence reveals:
hidden capex needs
lease issues
income overstated
major repairs required
…it’s common to renegotiate price or terms.
Beginner mindset: re-trading isn’t “being difficult.” It’s aligning price with reality.
Beginner Due Diligence Checklist (Copy/Paste)
Financial
T-12 + rent roll
bank deposits verification
tax bill + reassessment risk
insurance quote + claims history
utilities + contracts
Leases
leases + amendments
estoppels (major tenants)
reimbursements & caps
renewal options / expirations
maintenance responsibilities
Physical
PCA / inspection
roof, HVAC, electrical
parking/drainage
deferred maintenance list + budget
Environmental
Phase I ESA
Phase II if flagged
Legal
title + survey
zoning confirmation
permits/violations
Financing
appraisal
lender conditions checklist
final DSCR/LTV compliance
FAQs
How long does due diligence take?
Often 30–60 days, depending on complexity.
Do I really need Phase I ESA?
In many cases, yes—especially for commercial and industrial history.
What’s the #1 diligence mistake beginners make?
Failing to verify income and failing to budget capex/leasing costs.
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