Data room due diligence is the buyer’s structured review of every document a seller puts in a secure repository during a transaction. In commercial real estate it means checking leases, rent roll, financials, third-party reports, title and contracts against the investment thesis before the due diligence period ends. Its value is in finding what is missing, late or inconsistent.
This page is the CRE version, written for the acquisitions team. If you arrived from an M&A search, see the comparison near the end.
Data Room Due Diligence Checklist (CRE)
A checklist is a tracker, not a method. Use it to log what has arrived and what has not, then read the highest-dollar items first. Send requests for gaps on day one.
| Folder | Documents | Who supplies it | Red flag if missing |
|---|---|---|---|
| Leases | Executed base leases, amendments, side letters, commencement agreements, SNDAs, guarantees | Seller / property manager | Amendment referenced but not uploaded; economics may differ from the rent roll |
| Rent roll | Current, dated rent roll | Seller | Rent roll not reconciled to leases, or several versions that disagree |
| Operating statements | T-12, historical statements, general ledger detail, bank statements | Seller / property manager | Summary only, no GL detail |
| Recoveries | CAM, tax and insurance reconciliations with backup | Property manager | No backup; under-recovery or billing that does not match lease terms |
| Property condition | Property condition assessment, roof reports and warranties, elevator and fire/life safety inspections | Seller / buyer consultant | Seller report is old or narrow in scope |
| Environmental | Phase I ESA, any prior Phase II or closure letters | Seller / buyer consultant | Components older than 180 days; no reliance for buyer |
| Title and survey | Title commitment, exception documents, ALTA survey, easements | Title company / seller | Exceptions not provided |
| Zoning and permits | Zoning letter, certificates of occupancy, permits, open code violations | Seller / municipality | Open violations or no certificate of occupancy |
| Taxes | Tax bills and appeal history | Seller | No appeal history, so assessment exposure is unknown |
| Insurance | Policies, loss runs | Seller / broker | No claims history |
| Contracts | Service contracts with termination provisions, management agreement | Seller | Contracts that do not terminate at sale |
| Capital history | Capex history with invoices, warranties | Seller | No invoices behind the figures |
| Utilities | Twelve months of utility bills | Seller | Estimates only |
The full CRE due diligence checklist breaks these out by line item.
What is usually missing on day one?
The items that tend to be absent when the room opens:
- Full lease sets with amendments, side letters, commencement agreements and SNDAs
- General ledger detail and bank statements
- CAM reconciliations and backup
- Service contracts and their termination provisions
- Loss runs
- Tax bills and appeal history
- Capex history with invoices, and warranties
- Prior environmental, PCA and survey reports
- Permits, certificates of occupancy and open code violations
- Utility bills
What should you request first?
Ask for these before anything else, because the longest lead times sit behind them:
- Leases and all amendments
- Rent roll
- T-12 and T-36 with general ledger detail
- Estoppel and SNDA forms, so you can send them early. The estoppel clock starts when the forms go out.
- Service contracts
- Loss runs
- Existing third-party reports
Most misses are not hidden facts. They are late arrivals that got skimmed.
What goes wrong in CRE data rooms?
The document dump. Hundreds of files in a few folders with no index. Catalog the room against your checklist before anyone starts reading, so the team knows what is and is not there.
The missing amendment. The base lease and Amendment 1 are uploaded, but a later amendment that changed the term or added a tenant improvement obligation is not. The model then carries the wrong expiration or the wrong capital cost. When a lease refers to an amendment that is not in the room, request it in writing.
Version confusion. An offering memorandum rent roll, an older rent roll and one marked current that disagree. Reconcile them to the leases and record which date each figure comes from.
The slow drip. Documents arrive in batches, so no workstream can finish. Track each request by date and escalate through the broker when items age.
The unreadable scan. Rent tables and signature pages that cannot be read invite transcription errors. Ask for a clean copy of anything where a number is in doubt.
How should the review be sequenced?
- Inventory (day one). Match every file to the checklist and send the first request list.
- Lease abstraction. Lease review is the bottleneck. Capture tenant, suite, area, term, base rent and escalations, renewal and termination options, allowances, expense structure, co-tenancy and exclusives, then compare each lease to the rent roll. The lease abstraction guide covers options.
- Financial analysis. Overlap this with lease review once the T-12 arrives. Check the rent roll against T-12 revenue, watch expense trends for deferred maintenance, and test the tax exposure. Reassessment on sale varies by state and county, so confirm the rule with the local assessor rather than assuming the seller’s bill carries over.
- Physical, environmental and legal. Read the PCA and Phase I, then title exceptions and zoning. Long-lead items go out first.
- Synthesis. Convert findings into a due diligence report for the investment committee, and reconcile across reports.
Reconcile across documents
The issues that matter most tend to sit between documents. A former dry cleaner next door in the Phase I, a roof near end of life in the PCA and a tenant repair obligation in the lease abstract only add up when read together. Decide before you start who owns that reconciliation.
What do experienced reviewers check that others skip?
Lease to rent roll. Compare every tenant’s lease rent to its rent roll line. A gap in rent per SF compounds across the area.
Amendment chain. If a lease cites Amendment 2 and the room holds only the base lease and Amendment 1, something is missing.
Expense recovery. Compare each lease’s recovery structure to what was actually billed. Under-recovery is either an opportunity or a sign the seller’s NOI is understated.
Tenant credit. The rent roll shows current tenancy, not trajectory. Check tenants against public news and filings.
Below-market renewal options. A tenant holding one controls the economics of its space for the option term. If much of the income is subject to those options soon, mark-to-market upside may not exist.
Re-trade timing. A problem found in week three can be re-traded cleanly. The same problem in week eight, after the deposit is hard, is a much weaker negotiating position.
How is M&A data room due diligence different from real estate?
| M&A data room | CRE data room | |
|---|---|---|
| Subject | A company | An asset |
| Core documents | Corporate records, contracts, employment, IP, litigation | Leases, rent roll, property financials, third-party reports, title, survey |
| Value driver | Earnings and liabilities of the business | Rollover, rent steps, recoveries, capex and environmental |
| Key third parties | Accountants, counsel | Engineers, environmental consultants, title, surveyors |
| Typical gap | Undisclosed liabilities | Missing amendments and late third-party reports |
Search results for “data room due diligence” are mostly M&A. A corporate checklist will not surface the lease and property documents that decide a real estate deal.
Where does software help?
Software handles the mechanical part of data room work: classifying files, extracting lease terms and cross-referencing the rent roll to leases. The judgment stays with the team, such as deciding whether a finding is material and how to price it.
Moraine reviews diligence documents for office, retail and industrial acquisitions and returns findings with page-level citations, so each flagged item can be traced to its source page. Exports are XLSX. A qualified underwriter should still review open items and source conflicts before IC.
Setting up the review
Start with the checklist, not the documents. Know what you need before you read what you have.
Send requests on day one. Do not wait until you need a document to ask for it.
Track versions. When an updated document is uploaded, record the date and flag any figure that changed.
Separate reading from analysis. Extract what each document says first, then decide what it means for the deal.
Document findings as you go. Give each a severity and a recommended action, so the end-of-period report is not written overnight.