Partner Engineering and Science vs AEI Consultants
Side by Side
| Attribute | Partner Engineering and Science | AEI Consultants |
|---|---|---|
| What It Is | A national environmental and engineering consultancy whose Phase I Environmental Site Assessments are a fixture of lender closing checklists. Reports follow the current ASTM E1527-21 standard, the firm participated in creating and updating that standard, and its own page says it supports approximately one in five commercial real estate transactions nationwide, from a single site to a portfolio. | An environmental and building sciences consultancy performing Phase I Environmental Site Assessments to the current ASTM E1527-21 standard, customizable to lender requirements. The firm cites over thirty years of experience and a nationwide team, and it publishes a Phase I checklist and full sample reports, including an agency-lender sample, so a first-time buyer can read exactly what the product contains before ordering one. |
| Category | Closing Vendors | Closing Vendors |
| Pricing Model | Custom Pricing | Custom Pricing |
| What It Costs | No published pricing; engagements are scoped and quoted. The firm's Phase I page (read Aug 2026) describes the product and the standard but carries no rate card, which is normal for this vendor class. | No published pricing; scoped and quoted per engagement (site read Aug 2026). The checklist and sample-report pages are open, but the engagement still starts with a quote. |
| Best For | The Phase I your lender orders on any acquisition that includes real property, especially where a fueled, industrial, or dry-cleaning past use makes currency with the ASTM standard matter. If the deal is a leased-premises asset purchase, ask the lender whether a cheaper records search satisfies them first. | A buyer who wants to understand the Phase I before paying for one: the published checklist and sample reports make this the most readable vendor in the class, and the agency-lender work means the reports satisfy institutional reviewers. |
| Where It Fits | Diligence & Close the Deal | Diligence & Close the Deal |
| Our Verdict | The default national name for the Phase I on a lender's checklist; confirm who orders it before you hire them yourself. | Read their sample report before you order anyone's Phase I; hire them if your lender has not already chosen. |
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Our take
Choose Partner when the lender is driving: its Phase I practice is a fixture of lender closing checklists, reports follow the current ASTM E1527-21 standard, and on many deals the bank will simply order from Partner's panel seat, which makes hiring your own copy a duplicated spend rather than a second opinion. That panel orientation is also the limit to hold: the firm is built for commercial real estate lenders, publishes no pricing or turnaround, and everything starts with a scoped quote, so on a small deal ask the lender first whether Partner is already in the file.
Choose AEI when you want to understand the Phase I before paying for one: it works to the same E1527-21 standard, customizes to lender requirements, and it is the readable side of this pair, publishing the checklist and sample reports that show a first-time buyer what the engagement actually produces. Two limits decide it: the open checklist is content marketing, with pricing and turnaround still arriving only by quote, and its center of gravity is commercial real estate and agency lenders, so a small asset deal is its smallest work rather than its specialty.
Put It to Work
Whichever side wins for you, Diligence Checklist carries the closing items these firms are hired to satisfy.