What is a Phase 1 environmental site assessment?
A Phase 1 environmental site assessment is a written report by an environmental professional on whether there is evidence of past or current contamination at a property. It relies on history and observation, not testing, and it’s the standard first step of environmental due diligence in commercial real estate.
Buyers order Phase I reports for two reasons. The first is liability: under federal Superfund law, a new owner can be on the hook for cleanup it didn’t cause unless it did its homework before buying. The second is financing, since commercial and multifamily lenders require one before they lend.
ASTM E1527-21 and the EPA All Appropriate Inquiries rule
Phase I reports follow ASTM E1527-21, the industry standard that EPA recognizes as meeting its All Appropriate Inquiries rule at 40 CFR Part 312. ASTM published E1527-21 in November 2021. EPA’s rule referencing it took effect February 13, 2023, and the older E1527-13 could be used only until February 13, 2024.
The AAI rule sets the minimum. The inquiry must be done by an environmental professional as defined in 40 CFR 312.10, someone with a combination of licenses, degrees and years of relevant experience set out in the rule. The results go in a written report that gives an opinion on conditions indicating releases and identifies data gaps.
How a Phase I ESA protects buyers under CERCLA
Under CERCLA, the federal Superfund law, a current owner can be liable for cleaning up contamination left by earlier owners. All Appropriate Inquiries is the gateway to three defenses: the bona fide prospective purchaser, the contiguous property owner and the innocent landowner.
A bona fide prospective purchaser can buy property even knowing it’s contaminated and still be protected, if the purchase was after January 11, 2002 and the buyer meets the statutory conditions. Each defense requires AAI before acquisition and continuing obligations afterward, such as reasonable care, cooperation with response actions and compliance with land use restrictions.
What a Phase I ESA covers
A Phase I ESA has four core parts under 40 CFR Part 312 and ASTM E1527-21: records review, site reconnaissance, interviews and a written report.
- Records review: federal, state, tribal and local environmental databases, plus historical sources such as aerial photos, fire insurance maps and city directories for the property and adjoining sites.
- Site reconnaissance: a walk of the property and a look at adjoining properties for tanks, drums, stains, stressed vegetation, vent pipes, drains and odors.
- Interviews: past and present owners, operators and occupants, and local government officials where useful.
- User responsibilities: the buyer searches for environmental cleanup liens, shares specialized knowledge and checks whether the price is far below market value for environmental reasons.
- Report: findings, data gaps, the environmental professional’s opinion and signed declarations.
How long is a Phase I ESA valid?
A Phase I ESA must be done within one year before the buyer acquires the property, and key parts must be done or updated within 180 days before closing. Under 40 CFR 312.20, those parts are the interviews, the cleanup lien search, the government records review, the site visit and the environmental professional’s declaration.
Let’s run the dates. If the site visit is March 2, 2026, the 180-day window runs to August 29, 2026, and the one-year limit falls on March 2, 2027. A closing that slips past August 29 needs an update, not a new report, as long as it closes before the year is up.
Lenders can be stricter. Freddie Mac’s multifamily guide wants the report dated within six months before the full underwriting package is delivered.
RECs, CRECs and HRECs: what the findings mean
A recognized environmental condition, or REC, is the finding that matters most: evidence of a release of hazardous substances or petroleum at the property, a likely release or a material threat of one. A REC doesn’t mean the property is contaminated. It means the evidence is strong enough that the buyer should look further.
ASTM E1527-21 also uses two related terms. A controlled REC, or CREC, is a past release that regulators accepted with controls left in place, such as a deed restriction or a cap. A historical REC, or HREC, is a past release cleaned up to unrestricted use with no controls needed. A de minimis condition is minor and usually wouldn’t lead to enforcement action.
| Finding | What it means | Typical next step |
|---|---|---|
| No RECs | No evidence of a release found | Deal moves forward |
| De minimis condition | Minor issue, not a REC | Usually none |
| HREC | Past release cleaned up to unrestricted use | Usually none; keep the closure letter |
| CREC | Past release closed with controls in place | Confirm the controls are followed |
| REC | Current or likely release, or a material threat | Phase II sampling or negotiation |
When a Phase II environmental site assessment is needed
A Phase II ESA is the next step when a Phase I finds a REC: a consultant takes soil, groundwater, soil gas or building material samples to confirm whether contamination exists and how much. Phase II work usually follows ASTM E1903.
For a seller, the Phase II is where the deal gets renegotiated. The buyer may ask for a price cut, an escrow holdback for cleanup, an indemnity or more time. Some buyers walk. Knowing the property’s history before you list puts you in a better spot to answer than learning it from the buyer’s report.
Lender requirements: Fannie Mae, Freddie Mac and HUD
Agency multifamily lenders all require environmental due diligence built on ASTM E1527. Fannie Mae’s Multifamily Guide requires a Phase I ESA of the entire property under its Form 4251 requirements and the current ASTM E1527, prepared by an environmental professional as defined in 40 CFR 312.10. Fannie Mae must approve the loan before rate lock if the report finds RECs or CRECs.
Freddie Mac’s Chapter 61 points to 40 CFR Part 312 and ASTM E1527-21, and it adds items ASTM treats as outside its scope. Properties built before 1978 are presumed to contain lead-based paint unless testing shows otherwise. The consultant decides whether radon testing is needed and investigates mold and water intrusion, and asbestos left in place needs an operations and maintenance program. HUD’s multifamily program requires Phase I reports to conform to E1527-21 for new applications after February 13, 2024.
What sellers should prepare before the buyer’s Phase I
You can’t stop a buyer from ordering a Phase I, but you can make it faster and cleaner. Pull these together before you go under contract.
Some sellers order their own Phase I before listing. The buyer’s lender will usually still want a report addressed to it or a reliance letter from the consultant, and the 180-day and one-year clocks run to the buyer’s closing date, so a seller’s report mainly buys early warning and a quicker update.
- Any prior Phase I or Phase II reports, even old ones, and the names of the consultants who wrote them.
- Records of underground or aboveground storage tanks, including heating oil tanks, removal reports and closure letters.
- Regulatory letters such as no-further-action letters, closure letters or notices of violation.
- Asbestos surveys, lead-based paint disclosures and inspection reports, radon test results and any operations and maintenance plans.
- Records of mold or water intrusion and how they were fixed.
- Past uses of the site and nearby properties you know about, such as a dry cleaner, gas station or auto shop.
- Access for the site visit, including vacant units, boiler rooms, basements and roofs.
How this works for a 5+ unit apartment building
With a 5+ unit apartment building, the usual Phase I issues are history and building systems, not industrial waste. Old heating oil tanks, a former gas station or dry cleaner next door, fill soil of unknown origin and vapor intrusion from a neighbor’s plume come up often.
Agency loans bring the non-scope items to the front. If the buyer is using Fannie Mae or Freddie Mac financing, asbestos, lead-based paint, radon and mold all get looked at, and an older building may need an O&M plan before the loan closes. PFAS can also come up now. EPA designated PFOA and PFOS as CERCLA hazardous substances in a 2024 rule.
Here’s how a finding usually gets handled. On a $4,200,000 sale, suppose the buyer’s Phase I flags a former heating oil tank and the Phase II confirms a small leak. The consultant estimates $85,000 to remove the tank and soil. The parties agree to a 125% escrow holdback of $106,250 at closing, with anything left over released to the seller once the state issues a closure letter.
Selling your building to Skyline
Skyline Capital Investments buys 5+ unit apartment buildings nationwide, including buildings with old tanks, past environmental findings or a Phase I that sank another buyer’s financing. We review the reports you have and price the deal around what they say.
Send the address and unit count through the form on this page or call (469) 660-2977. We typically respond within 48 hours.
