Industry Insights & Resources

Complete Environmental Diligence Before You Acquire the Real Estate

Written by Calvin Abercrombie, SBA BDA | Aug 20, 2026, 1:04:29 PM

CURRENT USE IS ONLY ONE CHAPTER

A clean, operating self-storage facility may sit on land once used for automotive, industrial, agricultural or other commercial activity. Environmental diligence looks backward, outward and below the surface.

Environmental risk is easy to underestimate at a self-storage property. The current operation may use few chemicals and produce little industrial waste. The buildings may be newer than the activity that created the concern.

The relevant history can involve a former gas station, repair shop, dry cleaner, farm operation, factory, rail use, dumping area or heating-oil system. A release from a neighboring property can also move through soil, groundwater or vapor.

The goal is to understand the property’s environmental condition, potential liability, development constraints and remaining uncertainty before the buyer acquires the real estate.

Order a Phase I Environmental Site Assessment

A Phase I Environmental Site Assessment is generally the starting point for environmental diligence on commercial real estate. It is a structured inquiry into the property’s history and current environmental conditions. It ordinarily does not include drilling, soil sampling or groundwater testing.

EPA recognizes ASTM E1527-21 as a standard that can be used to satisfy federal All Appropriate Inquiries requirements. EPA describes All Appropriate Inquiries as the process of evaluating a property’s environmental conditions and assessing potential liability for contamination.

Source: U.S. Environmental Protection Agency, Brownfields All Appropriate Inquiries

The Phase I process commonly includes:

  • Historical aerial photographs and maps
  • City directories and prior addresses
  • Federal, state and local environmental databases
  • Interviews with current and past owners, operators or occupants where available
  • A site reconnaissance
  • Observation of adjoining properties
  • Review of tanks, drums, stains, drains, waste areas and other indicators
  • Environmental liens and activity or use limitations
  • Prior environmental reports and cleanup records
  • An environmental professional’s findings and recommendations
  • Who engaged the environmental professional
  • Who may rely on the report
  • Which property and parcels are covered
  • Which ASTM standard was used
  • The dates of the site visit, records review, interviews and lien search
  • Whether the report addresses the buyer’s intended use and development plan
  • Whether prior reports were independently reviewed
  • Which areas could not be accessed
  • Whether the lender has separate requirements
  • Property description and parcel boundaries
  • Historical-use narrative
  • Database findings
  • Adjoining-property discussion
  • Site observations and photographs
  • Interviews
  • Prior reports and agency files
  • Findings and opinions
  • Data gaps
  • Limitations and excluded areas
  • Non-scope observations
  • Recommendations for additional work
  • Historical sources unavailable for an important period
  • Former owners or operators who cannot be interviewed
  • Locked or unsafe areas not observed
  • Snow, stored materials or structures blocking the ground surface
  • Missing tank, spill or cleanup records
  • Unclear parcel boundaries
  • Adjoining properties that cannot be observed adequately
  • A regulatory file that has not been obtained
  • Gas stations and fuel distribution
  • Automotive, truck or equipment repair
  • Dry cleaners
  • Manufacturing and metalworking
  • Machine shops and printing
  • Rail spurs, depots and freight yards
  • Landfills, dumping areas and uncontrolled fill
  • Agricultural chemical storage, mixing or equipment maintenance
  • Vehicle, equipment and salvage yards
  • Bulk petroleum or chemical storage
  • Wastewater lagoons, pits and floor drains
  • Former military, utility or government operations
  • Tank registrations and closure records
  • Installation, removal and abandonment documentation
  • Soil or groundwater sampling from closure
  • Release reports and cleanup files
  • Piping, fill ports, vents and dispenser locations
  • Historical fire-insurance maps and aerial photographs
  • Unexplained concrete patches or depressions
  • Former boiler or heating systems
  • Current propane, fuel or generator tanks
  • Agency confirmation that the file is complete
  • Current and former uses on adjoining land
  • Reported releases and regulatory status
  • Distance and direction from the subject property
  • Known or inferred groundwater flow
  • Topography and drainage
  • Contaminants involved
  • Depth and extent of impacts
  • Whether vapor migration is a plausible pathway
  • Whether off-site cleanup or monitoring is ongoing
  • Whether agency records support the conclusion
  • Soil sampling near a former tank or stained area
  • Groundwater sampling downgradient from a release
  • Soil-gas or sub-slab sampling for vapor concerns
  • Testing fill material
  • Sampling around former drains, pits or waste areas
  • Building-material sampling when renovation or demolition is planned
  • Roofing and flashing materials
  • Pipe and duct insulation
  • Flooring and adhesive
  • Wallboard systems and joint compound
  • Fireproofing and coatings
  • Painted building components
  • Office, apartment or older accessory structures
  • Areas that will be disturbed by expansion or repair
  • Where moisture is entering or condensing
  • How long the condition may have existed
  • Which units or building materials are affected
  • Whether stored property claims occurred
  • Whether climate-control performance contributes
  • Whether materials need cleaning or removal
  • How the source will be corrected
  • How repair work will be verified
  • Wetland indicators and delineation
  • Streams, channels and jurisdictional waters
  • Required buffers
  • Federal, state and local permitting
  • Prior fill or drainage alterations
  • Mitigation requirements
  • Seasonal conditions that were not visible during inspection
  • Effect on expansion, access and stormwater design
  • Contaminants and likely source
  • Horizontal and vertical extent
  • Soil, groundwater and vapor pathways
  • Regulatory agency and case status
  • Cleanup standards and intended land use
  • Groundwater-use restrictions
  • Excavation and soil-management requirements
  • Monitoring wells and access obligations
  • Remediation systems and operating cost
  • Off-site migration and third-party claims
  • Closure requirements and continuing obligations
  • Current operation
  • Proposed expansion footprint
  • Areas of excavation or demolition
  • New utilities and drainage work
  • Changes in use
  • Planned construction schedule
  • Need for phased occupancy
  • Lender and insurer requirements
  • Recorded environmental covenants or deed notices
  • Activity and use limitations
  • Groundwater restrictions
  • Caps, liners or vapor systems to maintain
  • Monitoring or inspection requirements
  • Agency access rights
  • Reporting and certification deadlines
  • Responsibility and budget for ongoing work
  • Who will manage compliance after closing
  • Access for the environmental professional
  • Interviews and document delivery
  • Permission for invasive testing
  • Notice and site-restoration requirements
  • Confidentiality and reporting
  • Responsibility for newly discovered conditions
  • Environmental representations
  • Ability to extend or terminate diligence
  • Escrows, indemnities or price adjustments
  • Lender approval and reliance requirements
  • Survival of representations after closing
  • Buyer-specific Phase I Environmental Site Assessment
  • User questionnaire and environmental lien search
  • Historical maps, aerials and directories
  • Prior environmental reports
  • Tank registration and closure records
  • Spill, release and cleanup files
  • Regulatory closure letters
  • Phase II work plan and results, if any
  • Vapor, asbestos, lead, mold or wetlands reports where applicable
  • Environmental covenants and use restrictions
  • Monitoring and continuing-obligation records
  • Correspondence with agencies
  • Written list of data gaps and access limitations
  • Environmental professional’s recommendations
  • Counsel’s summary of unresolved liability and post-closing obligations
  • The buyer is asked to rely on a seller’s old Phase I
  • The report does not cover every parcel being acquired
  • Time-sensitive AAI components may be stale before closing
  • Important areas could not be accessed
  • A former automotive, industrial or fuel use is dismissed without explanation
  • Tank removal is claimed without closure documentation
  • A nearby release is listed without discussing migration or vapor
  • Agency files are missing or incomplete
  • Cleanup is called closed without summarizing restrictions or continuing duties
  • Testing is recommended but the contract does not allow enough time
  • The development plan involves excavation that the report does not address
  • Asbestos, lead, mold or wetlands concerns are assumed to be covered by the Phase I
  • The purchase becomes nonrefundable before material follow-up can be completed

Make the report belong to the buyer and the transaction

A seller’s earlier Phase I can provide useful background. It should not automatically be treated as the buyer’s final report.

Confirm:

A report prepared for another party may have reliance limitations. It may also predate later operations, spills, nearby releases or changes in the standards. Environmental counsel and the environmental professional can help determine whether a new report, reliance letter or update is appropriate.

Track the All Appropriate Inquiries timing rules

Timing is part of the diligence. EPA states that the inquiry must generally be conducted or updated within one year before acquisition. Certain components must be conducted or updated within 180 days before acquisition, including interviews, government-record review, the on-site visual inspection and searches for environmental cleanup liens.

Source: U.S. Environmental Protection Agency, All Appropriate Inquiries Final Rule fact sheet

A delayed closing can require updates. Track the completion dates for each time-sensitive component and compare them with the expected acquisition date. Ask the environmental professional and counsel what must be refreshed and what continuing obligations may apply after closing.

THE DATE ON THE COVER IS NOT THE WHOLE TIMING ANALYSIS

A report may look current while one or more required components are outside the applicable period. Track the work performed, not only the report-delivery date.

Understand what the Phase I does and does not do

The Phase I is intended to identify environmental conditions through inquiry, records and observation. It does not guarantee that contamination is absent. It also has a defined scope and may not address every health, building-material, ecological or regulatory issue that matters to the transaction.

Read the full report, including:

The executive summary is useful for orientation. The body and appendices show how the conclusion was reached and where uncertainty remains.

Read the environmental-condition classifications carefully

ASTM terminology helps the environmental professional communicate the significance and status of conditions. Ask for a plain-English explanation of each classification and its practical consequence for the transaction.

Recognized environmental condition

A condition indicating the presence or likely presence of hazardous substances or petroleum products under circumstances that warrant attention under the standard.

Controlled recognized environmental condition

A condition addressed through controls or restrictions that remains subject to continuing obligations, such as maintaining a cap or limiting groundwater use.

Historical recognized environmental condition

A past release that has been addressed to the satisfaction of the applicable authority or under criteria that allow unrestricted use, as evaluated under the standard.

The exact conclusion belongs to the environmental professional. The buyer should understand what was released, where it was located, what cleanup occurred, which agency acted, whether closure was issued and whether any obligations survive.

Take data gaps and access limitations seriously

A data gap is missing information that affects the inquiry. It is not automatically a reason to reject the property. The environmental professional should explain whether the gap is significant and whether it limits the ability to form an opinion.

Examples include:

Ask what additional source, inspection or testing could reduce the uncertainty and whether the work can be completed before the diligence deadline.

Reconstruct the land-use history before self-storage

The current storage operation may have been built after the use that created the environmental concern. Study the property far enough back to understand meaningful prior activities.

Uses that can justify closer review include:

Look for changes in addresses and parcel configuration. A facility may occupy several lots that had different histories, or a former operation may have sat on only one part of the current property.

Investigate underground and aboveground storage tanks

Underground tanks may have held gasoline, diesel, heating oil or other liquids. Aboveground tanks, piping and dispensers can also create release concerns.

Review:

A statement that a tank was removed is incomplete without understanding when, how and under what regulatory process. If closure sampling was limited or contamination was reported, the environmental professional should explain the remaining concern and recommended follow-up.

Look outward at neighboring properties

Environmental conditions do not stop at the property line. Groundwater and soil vapor can migrate from a nearby source.

Evaluate:

A database listing alone does not establish that the site is affected. The report should explain why the neighboring release is or is not a concern for this property.

Understand vapor intrusion as a separate pathway

EPA explains that vapor intrusion can occur when volatile or semivolatile chemicals in soil or groundwater migrate toward buildings and enter through cracks and openings. Petroleum vapor intrusion is one form of this pathway.

Vapor concerns can arise from the subject property or a nearby release. The evaluation may consider the contaminant, distance, geology, groundwater, building slab, utility pathways and intended occupancy. Soil-gas, sub-slab or indoor-air testing may be recommended when the Phase I cannot resolve the question.

Source: U.S. Environmental Protection Agency, Vapor Intrusion Resources

Know when a Phase II may be recommended

A Phase II investigation uses sampling or testing to evaluate a defined concern. The scope should be designed around the question identified during the Phase I.

Examples include:

Before testing, align the environmental professional, counsel, lender and contract requirements. Clarify access, restoration, reporting, agency-notification concerns, ownership of results and what happens if contamination is discovered.

TESTING SHOULD ANSWER A DECISION QUESTION

A broad sampling package can spend money without resolving the issue. The work plan should state what is being tested, why those locations and methods are appropriate, and how the results will affect the acquisition decision.

Consider asbestos and lead-based materials separately

Asbestos-containing materials and lead-based paint may fall outside the standard Phase I scope. They can still affect renovation, demolition, maintenance, worker protection, disposal cost and schedules.

Depending on building age, materials and planned work, a qualified professional may evaluate:

A visual statement that a material appears intact does not identify its composition. Sampling, laboratory analysis and an operations or abatement plan may be appropriate when the material will be disturbed or its condition creates concern.

Evaluate mold through the moisture source

Mold and moisture issues may also fall outside the standard Phase I. Review odor, staining, condensation, active leaks, flood history, HVAC performance and customer complaints.

The investigation should focus on:

Surface treatment without correcting the water or humidity source can allow the condition to return.

Review wetlands and water-related constraints

Wetlands review is different from a Phase I contamination inquiry. It can affect development, expansion, drainage work and the usable area of the property.

For land with low areas, drainage features, standing water, mapped resources or planned disturbance, ask the appropriate consultant about:

A dry-day site visit or ordinary survey may not resolve wetlands jurisdiction. The needed work depends on location and the planned project.

Investigate soil and groundwater contamination

Soil and groundwater impacts can affect cleanup cost, excavation, utility work, vapor risk, disposal and future development.

If contamination is known or suspected, understand:

A “closed” regulatory case may still include use restrictions, caps, monitoring or soil-handling requirements. Obtain the closure documents and have the environmental professional and counsel explain what survives the transaction.

Consider the buyer’s development and operating plan

Environmental risk is tied to what the buyer intends to do. A condition manageable under the current pavement and buildings may become more important when the plan involves excavation, new foundations, utilities, stormwater work or residential occupancy.

Give the environmental professional a clear description of:

The conclusion should address the real plan rather than a generic acquisition of the parcel in its current condition.

Review continuing obligations and institutional controls

Some liability protections and regulatory closures depend on actions after acquisition. These may include complying with land-use restrictions, cooperating with response actions, maintaining engineering controls, providing notices or taking reasonable steps regarding releases.

Document:

Environmental counsel should evaluate the requirements that apply to the transaction and owner. A favorable Phase I conclusion does not replace post-closing compliance when controls already exist.

Protect the environmental diligence period in the contract

The purchase agreement should provide enough time and access for the Phase I, agency-file review and reasonable follow-up. Counsel can tailor the provisions to the property and transaction.

Topics may include:

Clarify the process before sampling begins. The buyer should know what happens if a concern is found and whether the schedule allows the result to inform the decision before the deposit becomes nonrefundable.

Build the environmental diligence file

Date the reports and track reliance rights. Keep the record with the property so future owners and operators can understand the basis for decisions and ongoing duties.

Warning signs that deserve a pause

AN ENVIRONMENTAL FINDING NEEDS A PATH TO RESOLUTION

Some conditions can be investigated, managed, remediated or addressed through the transaction. The buyer needs to understand the remaining uncertainty, cost, schedule, legal consequence and continuing obligations before acquiring the land.

Know what environmental risk follows the land

A thorough environmental process does not promise that every subsurface condition has been found. It gives the buyer a disciplined basis for understanding history, recognizing warning signs, completing focused follow-up and deciding which uncertainty can be accepted.

Ask one final question: If the known conditions, controls and recommended investigation become your responsibility at closing, do you understand the path forward and still want to own the real estate?

Frequently Asked Questions About Environmental Due Diligence for Self-Storage

1. Does a clean Phase I Environmental Site Assessment guarantee that a self-storage property is contamination-free?

No. A Phase I evaluates environmental risk through records, interviews and visual observations. It generally does not include soil, groundwater or vapor testing. A report with no recognized environmental conditions means the assessment did not identify a condition meeting that classification based on its scope and available information.

2. Can a buyer rely on the seller’s Phase I environmental report?

A seller’s report can provide useful background, but it may not give the buyer reliance rights or satisfy the buyer’s lender and liability-protection needs. Confirm who commissioned it, which parcels it covers, when its components were completed and whether it addresses the planned transaction. A new assessment, update or reliance letter may be required.

3. What happens if closing is delayed after the Phase I is completed?

The assessment may need to be updated. Federal All Appropriate Inquiries requirements generally impose a one-year window before acquisition, with certain components required within 180 days. Buyers should track the dates of interviews, government-record reviews, site inspection and environmental-lien searches against the revised closing date.

4. When does a self-storage property need a Phase II environmental investigation?

A Phase II may be recommended when the Phase I identifies a specific concern that sampling could clarify. Examples include a former fuel tank, repair shop, dry cleaner, stained area, undocumented fill or nearby release. The testing scope should target the identified issue rather than apply a generic sampling plan.

5. Can contamination from a neighboring property affect a self-storage facility?

Yes. Contaminated groundwater, soil vapor or surface drainage can cross property boundaries. The evaluation should consider the neighboring use, contaminant, distance, groundwater direction, topography, cleanup status and possible migration pathways. A database listing alone does not prove that the self-storage property is affected.

6. Why does a buyer’s expansion plan matter during environmental diligence?

Construction can disturb conditions that are manageable beneath existing pavement or buildings. Excavation, foundations, utility trenches and stormwater work may encounter contaminated soil, groundwater, buried tanks or regulated building materials. The environmental professional should evaluate the property in light of the buyer’s actual construction and operating plan.

7. Can a closed environmental case still create obligations for a new self-storage owner?

Yes. Regulatory closure may include groundwater restrictions, soil-management rules, recorded covenants, monitoring, vapor systems or requirements to maintain pavement or another protective cap. Buyers should review the closure documents and identify the cost, reporting duties and land-use restrictions that continue after closing.

 

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