Commercial Property Due Diligence Checklist for Buyers

Picture a buyer working through a commercial property due diligence checklist on an older office building in the District. The rent roll ties to the leases. The property condition report flags the roof, and the negotiation turns to a credit. Nobody asks for the building’s energy performance file. DC’s first BEPS compliance cycle ends December 31, 2026, and DOEE’s guidance makes the owner at the end of the cycle responsible for meeting the standard and paying any alternative compliance payment. If the building is behind on its pathway, a buyer who closes late in the year inherits that exposure.

Due diligence rarely fails on the obvious items. It fails on the item nobody owned, or the one that took longer than the period allowed. This guide is a workstream checklist for buyers of office, retail, industrial and small multifamily assets in DC, Northern Virginia and Maryland, and for their asset managers. It covers what to order on day one, the documents and red flags in each workstream, the DMV rules that change the answer, and how to separate deal-breakers from negotiables. It reflects how our investment sales team coordinates diligence for buyers.

This is not legal, tax or engineering advice. Your purchase and sale agreement (PSA) controls the deadlines, the deliverables and your right to walk away, so read every item below against it with counsel.

What does the PSA control during due diligence?

The PSA sets the rules: how long the due diligence period runs, what the seller must deliver and when, what access you get, when your deposit becomes non-refundable, and which conditions survive to closing. Read these clauses before you order anything:

• Period and extensions. When the clock starts, whether you can extend it, and how you terminate. Follow the notice clause exactly; a termination sent the wrong way may not count.
• Seller deliverables. A named list with a delivery deadline. If the period starts at signing and documents arrive late, that time is gone.
• Access and testing. Notice to enter, limits on disturbing tenants, insurance your consultants must carry, and whether invasive testing such as soil borings or roof cores needs separate consent.
• Closing conditions. Estoppel and SNDA requirements, title and survey objection rights, and the seller’s representations with their survival period and cap.
• Service contracts. Which contracts you can require the seller to terminate before closing.

A finding is leverage only if the PSA gives you a way to act on it.

What should you order on day one, and what takes longest?

Order every third-party report and government letter on the first day, then chase the seller’s documents. The longest lead times sit outside your control: government letters, estoppels, utility data and follow-up environmental work. No standard durations exist, but official sources publish some timing, as of October 2026:

Item	Published timing	Source
DC zoning compliance letter	Online, within three business days	DC DOB
Fairfax zoning compliance letter	Up to 30 calendar days	Fairfax County
Arlington zoning compliance letter	Law allows 90 days; 30–45 days typical	Arlington County
Montgomery zoning confirmation letter	Within 7 business days	Montgomery DPS
Phase I key components	Within 180 days before acquisition	EPA AAI rule
Maryland BEPS records	Before the buyer signs a contract	COMAR 26.28.02.05

A day-one sequence that works:

1. Day one. Title commitment, survey, property condition assessment (PCA), Phase I, zoning letter or zoning report, insurance quote, lien and judgment searches, and the full seller document request.
2. As soon as the PSA allows. Estoppel and SNDA requests. Each lease sets its own response period, so pull those periods from the abstracts first.
3. First week. Site walk with consultants; interview the property manager and chief engineer.
4. Mid-period. Lease audit, reconciliation review, and a first issues list to the seller.
5. Before the period ends. A written objection letter and the go or no-go decision.

If a Phase I recommends a Phase II, the sampling may not fit inside the period. Negotiate an extension right tied to that recommendation before you sign.

What belongs in the financial due diligence checklist?

Financial diligence rebuilds net operating income from source documents, not the offering memorandum. Tie every line to a lease, an invoice or a bill.

Document	What to check	Red flag
Certified rent roll	Ties to leases and estoppels	Rent or term differs from lease
T-12 and prior-year statements	Recurring vs one-time items	Repairs cut before the sale
CAM reconciliations	Method, caps, gross-ups, exclusions	Open tenant audits or credits owed
AR aging	Who pays late, and why	Arrears hidden by concessions
Current budget	Assumptions vs actuals	Expense lines below history
Tax bills and assessments	Current value, pending appeals	Refund rights not addressed
Utility bills	Full history by meter	Gaps and estimated reads
Deposits and letters of credit	Amounts and transfer steps	Letters of credit needing reissue
Open leasing costs	Unpaid TI and commissions	Obligations with no credit

Rebuild expenses line by line; our commercial property operating budget guide explains what drives each line. Reconciliations show whether the seller recovers what the leases allow and whether tenant audits are pending. One still open at closing needs a proration rule in the PSA: who collects the true-up and who pays refunds. Our CAM reconciliation guide covers the math and backup.

Property tax works differently across the region:

• DC uses an annual assessment cycle. OTR says new owners can, in most cases, petition for an administrative review within 45 days of the purchase date.
• Fairfax County reassesses every year, with January 1 as the effective date.
• Maryland reassesses each property every three years through SDAT and phases in increases.

In every jurisdiction, ask whether an appeal is pending, and write into the PSA who keeps any refund for pre-closing years.

How do you review leases, estoppels and SNDAs?

Read every lease, amendment and side letter, abstract them, and test the abstracts against tenant estoppels. The rent roll is the seller’s summary. The leases are the contract you are buying.

Item	What to capture	Why it matters
Lease abstracts	Term, rent steps, recoveries	Basis for underwriting
Options	Renewal, expansion, termination	Can cap upside or end income
Rights to buy	ROFR, ROFO, purchase option	Can block or reprice the sale
Critical dates	Notice windows, expirations	Missed dates cost money
Use clauses	Exclusives, co-tenancy, go-dark	Limit future leasing
Estoppels	Rent, term, defaults, offsets	Tenant confirms the facts
SNDAs	Which loans have signed SNDAs	Lender closing condition
Guaranties and credit	Burn-offs, transfer steps	Credit support can lapse

A tenant’s right of first refusal or purchase option is a gating item. Ask counsel whether this sale triggers it and whether the seller has a written waiver.

Compare each returned estoppel with your abstract, not the rent roll. Every difference is an issue for the seller to resolve before closing: a different expiration date, a claimed offset, unfinished landlord work, or an amendment you never saw. If a tenant will not sign, the PSA may allow a seller estoppel instead; know how long it survives. Our commercial lease abstract guide has a field-by-field template and a critical-dates method.

What does physical due diligence cover?

Physical diligence prices condition. The core is a PCA, often scoped to ASTM E2018-24, plus specialist reviews wherever a walk-through can only observe.

ASTM says to rely on an E2018 report only for the point in time of the observations, and it treats accessibility as an abbreviated screening. Add depth where the money is. Our property condition assessment guide covers how to scope one, read its repair and reserve tables, and negotiate with it.

System	Request from seller	Specialist to add
Roof	Age, warranty, repair history	Roof consultant
HVAC and controls	Asset list, PM records	Mechanical engineer
Electrical	Service size, test records	Electrical engineer
Plumbing	Riser and backflow records	Plumbing review
Elevators	Certificates, service contract	Elevator consultant
Fire and life safety	Inspection and test reports	Fire protection engineer
Accessibility	Prior surveys, complaints	Accessibility specialist
Structure and facade	Prior reports, repairs	Structural engineer
Site and parking	Paving, drainage, lighting	Civil review if needed

Ask for asset-level maintenance history, not just invoices; it is what lets an assessor judge remaining life. Our facility condition assessment guide explains how a PCA differs from an FCA and how to challenge cost opinions.

Confirm elevator and fire protection certificates are current and cited deficiencies are closed; our guides to elevator compliance and fire and life safety inspections cover DMV rules. For accessibility, 28 CFR 36.201(b) makes both the landlord and the tenant of a place of public accommodation subject to ADA Title III, and a lease allocates the work only as between the two of them. Our ADA compliance guide covers what to check.

What does a Phase I ESA under ASTM E1527-21 cover?

A Phase I environmental site assessment looks for evidence of hazardous substance and petroleum releases through records, interviews and a site visit. EPA’s All Appropriate Inquiries rule (40 CFR Part 312) recognizes ASTM E1527-21 as a way to meet AAI. A buyer needs AAI to claim CERCLA protection as a bona fide prospective purchaser, contiguous property owner or innocent landowner.

• Timing. AAI must be conducted or updated within one year before acquisition. The interviews, government records review, site visit and lien search must be within 180 days. A seller’s or lender’s report may be too old by closing, so plan an update.
• Your own inquiries. The rule expects the buyer to search for environmental cleanup liens, report any specialized knowledge, and consider whether the price reflects the value of an uncontaminated property.
• Continuing obligations. The protections also depend on what you do after closing.
• Non-scope items. Asbestos, lead-based paint, mold and PCB-containing building materials sit outside the standard scope unless you add them.
• PFAS. EPA designated PFOA and PFOS as CERCLA hazardous substances in 2024. Ask how your consultant evaluated them.
• Renovation plans. The asbestos NESHAP (40 CFR 61.145) requires a thorough inspection of the affected area before renovation or demolition, so an existing asbestos survey helps price capital work.
• Pre-1978 apartments. Federal lead disclosure rules require the seller of most pre-1978 housing to disclose known lead-based paint and hazards, provide records, and give the purchaser a 10-day opportunity for an inspection or risk assessment.

If the Phase I identifies a recognized environmental condition, the consultant may recommend a Phase II with sampling.

What should title and survey review include?

Title review tells you what you own and what burdens it. The survey shows where those burdens sit. Order both on day one and review them together.

• Title commitment, with copies of every Schedule B exception document.
• Easements, reciprocal easement agreements, covenants, recorded lease memoranda, and parking or access agreements.
• Liens, judgments and tax liens, plus a payoff plan for the seller’s debt.
• Seller authority documents and the endorsements you and your lender need.

The current ALTA/NSPS standards took effect February 23, 2026 and superseded all earlier versions. Ask for a “2026 ALTA/NSPS Land Title Survey” and list the optional Table A items you want:

Table A item	What it adds
3	Flood zone classification
6(a), 6(b)	Zoning data from a report you supply
7	Building dimensions, footprint, height
9	Parking space count and type
11	Underground utility evidence
13	Adjoining owners from tax records

Item 6 relies on a zoning report or letter you supply, and the surveyor does not interpret the code, so order zoning work early. The 2026 standard also requires evidence of possession or occupation along the entire perimeter, which helps you find encroachments. Check the flood zone yourself on the FEMA Flood Map Service Center.

How do you check zoning, occupancy and open permits in DC, Virginia and Maryland?

Confirm three things: the zone allows the current use, each space has a valid occupancy approval, and no open permits or violations attach to the property. Each jurisdiction names these differently.

Check	DC	Fairfax	Arlington	Montgomery
Zoning lookup	DCOZ zoning map	Zoning District Analyzer	Interactive Zoning Map	MCAtlas Find My Zone
Zoning letter	Zoning compliance letter	Zoning compliance letter	Zoning compliance letter	Zoning confirmation letter
Occupancy	Certificate of Occupancy	Non-RUP	Certificate of Occupancy	Use and Occupancy certificate
Permit records	Scout	PLUS	Permit Arlington	DPS Data Search

The letters differ in what they cover:

• Fairfax County’s zoning compliance letter states the zoning, proffered conditions and other approvals, whether existing development conforms, and any pending applications or violations.
• Arlington’s zoning compliance letter lists the zoning, known nonconformities, special exceptions, outstanding violations and certificates of occupancy on file. It does not verify building or fire code compliance.
• Montgomery County’s zoning confirmation letter identifies the zone and may cover permitted uses and violations. DPS does not cover Rockville or Gaithersburg; ask those cities.

Occupancy approvals often attach to a tenant or owner, not the building. Fairfax says each commercial tenant needs its own Non-Residential Use Permit, which is not transferable and ends when the tenant leaves. DC’s Department of Buildings lists “ownership change” as a C of O application type when ownership changes but the use does not. Ask the seller for a schedule of occupancy approvals by suite, and ask it to close open permits or price the work.

A zoning letter is not a zoning report. A third-party zoning report tests the property against use, parking, height, setback and density rules.

Which contracts, warranties and systems transfer at closing?

You inherit the building’s contracts, warranties, data and access. Each needs a decision before closing.

Item	What to request	Decision
Service contracts	Term, renewal, termination terms	Assume or terminate
Management agreement	Term, termination fee	Terminate or replace
Warranties	Roof, equipment, workmanship	Transfer steps, conditions
Maintenance records	Asset list, PM history, open orders	Load into your CMMS
Building systems	BAS, access control, cameras	Owner-held admin credentials
Keys and fobs	Key schedule, fob database	Rekey or reprogram
Utilities	Account numbers, data access	Transfer at closing
Operating certificates	Elevator, boiler, backflow	Current and on file

Contracts with automatic renewal or no termination for convenience become yours, and assignment may need vendor consent. Mark each one assumed or terminated in the PSA, with the seller paying to exit those you reject. Warranties often carry conditions such as registration, approved contractors and documented maintenance, and a transfer may need the manufacturer’s consent. Ask for the documents, not a summary.

The maintenance record is your best preview of year one. If the seller ran a CMMS, ask for the asset register and work-order history before closing. When Levaru takes over a building, we load the asset list and service history into our in-house CMMS and tag equipment with QR codes. Owners then see work orders with photos, PM schedules, inspections and invoices in a portal that is read-only apart from submitting service requests.

Building automation, access control and camera systems often run on vendor-held administrator accounts. Get owner-level credentials at closing.

What insurance and claims history should you review?

Insurance diligence shows what the building will cost to insure and what has already gone wrong. Get a quote early; an insurer’s inspection can surface conditions the PCA missed.

• Loss runs for as many years as the carrier will provide, plus open claims.
• Pending or threatened litigation, including tenant, injury and contractor claims.
• Flood zone, and water-intrusion history from the manager.
• Tenant certificates of insurance compared with lease requirements.
• The PSA’s risk-of-loss and condemnation terms between signing and closing.

What energy and compliance exposure do DC and Maryland buyers inherit?

In DC and Maryland, benchmarking and building energy performance standards (BEPS) travel with the building, and the rules make the seller hand over records. As of October 2026, Virginia has no benchmarking or BEPS mandate for privately owned buildings.

Item	DC	Maryland (outside Montgomery)	Montgomery County
Benchmarking	Private 10,000 sq ft+, by May 1	35,000 sq ft+, by June 1	25,000 sq ft+, by June 1
Standard	BEPS Period 1 ends Dec 31, 2026	Standards start 2030	County BEPS
Seller duty	Disclose BEPS data before sale	Disclose and transfer records before contract	Give records to new owner
Buyer duty	Notify DOEE within 60 days of closing	Keep reporting	Report if owner on June 1

DC. Per DOEE’s change-of-ownership guidance, a sale does not exempt a building. The owner at the end of the cycle must meet the standard and pay any alternative compliance payment, which DOEE’s guidebook caps at $10 per square foot of gross floor area and $7.5 million per building, adjusted for actual performance. The seller must disclose the information listed in 20 DCMR § 3519.13 before the sale. Ask for the pathway selection, progress reports and any delay request. DOEE says Period 2 begins January 1, 2029 and covers private buildings of 25,000 square feet and up.

Maryland. COMAR 26.28.02.05 requires the seller, before the buyer signs a contract, to disclose that the building is covered and hand over the benchmarking record, verification, any alternative compliance fee documentation, the baseline and the standards. Ask for this at letter-of-intent stage.

Montgomery County. Since October 1, 2025, county buildings follow the county program, not the statewide BEPS. DEP says outstanding obligations and liabilities pass to the new owner.

Our BEPS deadlines guide and energy benchmarking guide cover thresholds, pathways and Portfolio Manager transfers. In Virginia, check site plan conditions for reporting requirements.

How do you assess tenant and market risk?

Tenant diligence asks whether the income will stay. Market diligence asks what replacing it would cost.

• Credit. Tenant financials and retail sales reports where leases require them, guarantor strength, and payment history.
• Rollover. Share of income from the largest tenants, and expirations during your hold.
• Interviews. With the seller’s consent, ask major tenants about service and renewal plans. Complaints are an early renewal signal; our tenant retention playbook shows what moves renewals.
• Market. Effective rents after concessions, not asking rents, and the supply pipeline.

Small multifamily in DC and Montgomery County carries extra rules:

• DC TOPA and DOPA. Before an owner sells a housing accommodation, D.C. Code § 42-3404.02 requires an opportunity for tenants to purchase. DOPA adds a District opportunity to purchase for buildings with five or more rental units where at least 25 percent are affordable. DHCD administers both (see its conversion and sale page). Build the process into your timeline with DC counsel.
• DC rent stabilization. Every rental unit must be registered with DHCD’s Rental Accommodations Division as stabilized or exempt, and unregistered units are treated as stabilized unless RAD approves an exemption. Check registrations against the rent roll.
• Montgomery County ROFR. The County, the Housing Opportunities Commission or a certified tenant organization, in that order, must be offered the chance to buy multifamily rental housing of four or more units before the owner sells to another party.
• Montgomery County rent stabilization. Annual increases on regulated units are capped at the lesser of CPI-U plus 3 percent or 6 percent.

Which findings are deal-breakers and which are negotiable?

A deal-breaker is a finding you cannot price, cure or insure before closing. A negotiable becomes a credit, a price change, a seller cure or an escrow. The line depends on your business plan and lender, so agree on it internally first.

Finding	Usually	Typical remedy
Title defect the insurer will not cover	Deal-breaker	Terminate
Phase I condition with unknown cleanup	Deal-breaker until scoped	Phase II, extension
Current use not permitted	Deal-breaker	Terminate
Unwaived tenant ROFR or purchase option	Deal-breaker until resolved	Written waiver
Estoppel shows major default or new termination right	Often a deal-breaker	Reprice or terminate
Unquantified BEPS payment near cycle end	Negotiable once priced	Credit or escrow
PCA deferred maintenance	Negotiable	Credit or price cut
Open permits, minor violations	Negotiable	Seller cure
Unwanted service contracts	Negotiable	Seller terminates
CAM and tax true-ups	Negotiable	Proration terms
Missing warranties or records	Negotiable	Credit or representation

Put every issue in one written objection letter, with the remedy you want and a response date.

Frequently asked questions

How long is a commercial due diligence period?

No law sets it. The PSA does, and the parties negotiate the length, the start trigger and any extensions. Size the period to the slowest item you need: a government zoning letter, estoppel response periods, a possible Phase II and lender requirements. Order those on day one, and negotiate an extension right tied to specific findings.

What documents should a buyer request first?

Start with the certified rent roll, every lease and amendment, the T-12 and prior-year statements, CAM and tax reconciliations, AR aging, tax bills, service contracts, warranties, prior PCA and environmental reports, occupancy approvals, loss runs and maintenance records. In DC and Maryland, add the benchmarking and BEPS records the rules require the seller to share.

Is a Phase I ESA required to buy commercial property?

No law requires one for every purchase. But a Phase I that meets EPA’s All Appropriate Inquiries rule is how a buyer qualifies for CERCLA liability protections, and ASTM E1527-21 is the standard EPA recognizes for it. Key components must be conducted or updated within 180 days before acquisition, so check the component dates on any report you inherit.

What is the difference between an estoppel and an SNDA?

An estoppel certificate is a tenant’s signed statement of lease facts on a given date, such as rent, term, deposit, amendments and defaults, which the buyer and lender rely on. An SNDA is an agreement among tenant, landlord and lender that subordinates the lease to the loan, protects a non-defaulting tenant after foreclosure, and commits the tenant to recognize a new owner.

Which ALTA/NSPS standards apply to a survey ordered now?

The 2026 Minimum Standard Detail Requirements for ALTA/NSPS Land Title Surveys, effective February 23, 2026, which superseded all earlier versions. Your request should call for a “2026 ALTA/NSPS Land Title Survey” and list the Table A items you need, such as flood zone, zoning data from a report you provide, building dimensions, parking counts and utilities.

Do buyers inherit a seller’s BEPS obligations in DC?

Yes. DOEE says a change of ownership does not exempt a building from BEPS. The owner at the end of the compliance cycle must meet the standard and pay any alternative compliance payment. The seller must disclose BEPS information before the sale, and the buyer must notify DOEE within 60 days of closing. Period 1 ends December 31, 2026.

How long does a zoning compliance letter take in the DMV?

It depends on the jurisdiction. DC’s Department of Buildings says you can get a zoning compliance letter online within three business days. Fairfax County says up to 30 calendar days. Arlington cites the 90 days Virginia law allows, with 30 to 45 days typical and no expediting. Montgomery County DPS says within 7 business days. Order on day one.