Looking for a Cost Segregation Authority Alternative?

What Cost Segregation Authority is today

Cost Segregation Authority's own domain, costsegauthority.com, now presents the company under the name CSA Partners. Its public materials describe a nationwide cost segregation company serving three groups directly: CPAs and tax advisors, real estate developers, and real estate investors. It cites over 30,000 engineering-based studies completed and more than 20 years in the field, and it positions its documentation as built to hold up under IRS scrutiny, with messaging built around protecting savings already identified rather than just finding them. Adjacent services on its site include what it calls 1245 exchange work and "Acre Basis" analysis. Details about Cost Segregation Authority (CSA Partners) come from its public materials as of October 2026; tell us if something is out of date.

That is a firm that serves developers, investors and the CPAs who advise them, and it runs a partner program for CPA firms. Its published messaging leans heavily on documentation strength, framing cost segregation as an audit question as much as a tax-planning one, which tracks with a client base that includes CPAs advising on the merits of a study before it is ordered. That framing makes sense for a firm that also sells through CPAs and advisors. A CPA vetting a study on a client's behalf before recommending it is a different sales motion than an owner searching for a number directly.

What Basis is built for instead

Basis Property Group serves commercial and short-term rental owners directly, one property at a time, based in Pennsylvania and serving the whole US. There is no requirement to come through a CPA firm or a developer relationship; the free Preliminary Benefit Estimate at /qualify is open to any owner in about 60 seconds, and it models the likely first-year acceleration before a dollar changes hands or a call gets scheduled. An owner does not need an existing CPA relationship or a developer's referral network to get that first number.

That office/warehouse example is a benchmark run, the scale of property an independent owner is likely comparing against a national firm's quote, not a multi-building institutional portfolio. It is also representative of the size of building most owners are actually asking about when they search for an alternative to a bigger national firm.

Where a nationwide, CRE-weighted firm has the edge

A firm with 20-plus years and 30,000-plus studies behind it has real depth on complex, large-scale commercial assets, and a CPA firm managing several client properties may prefer a single vendor relationship built for that volume, with the dedicated engineering contact CSA lists for partner firms. If your entry point is a developer relationship or a CPA firm's existing referral network, that structure is a genuine advantage, not a weakness to work around.

A firm that also offers adjacent services like 1245 exchange analysis alongside cost segregation may be worth considering if your portfolio already touches those areas, the same logic that applies when weighing a broader specialty-tax house against a focused shop. Scale also tends to bring process maturity: a firm that has run 30,000 studies has likely encountered nearly every property configuration an examiner could question, which shows up in how the documentation is structured. None of that is a reason to default to the bigger name automatically; it is a reason to weigh it honestly against what a focused, direct alternative offers on the same building.

Where Basis fits better

An individual owner of one commercial building, or a short-term rental owner who does not have (or want) a CPA-mediated relationship, usually wants two things fast: a number before committing, and a study priced for a single property rather than a portfolio-scale engagement. Both tiers, budget and full engineered, deliver the same 70-page ATG-aligned report; the difference is scope, not documentation quality. STR studies skip the site visit entirely, working from the owner's existing Airbnb or VRBO listing photos, with no coordination through a third party required at any step. See why owners choose Basis for the full picture. Neither the estimate nor the study itself requires routing a single-property decision through layers of a larger firm's account structure. That directness is the main thing an individual owner gives up by choosing scale over focus, and it is worth weighing against whatever institutional polish the larger option brings to the table.

Getting your number

Whether a nationwide developer-facing firm or a direct, estimate-first shop fits your situation depends on how you hold the property and who else is involved in the decision. The free qualifier at /qualify gives you a real number in either case, with no commitment attached and no referral required to access it.

An owner comparing quotes from both ends of the market benefits from having a real number in hand before either conversation goes further. A nationwide firm's proposal will reflect its own process and pricing; the free estimate reflects what your specific building's components are actually likely to produce, independent of which firm eventually does the work. There is no cost or obligation attached to running the numbers before you decide who does the study.

Frequently asked questions

Is Cost Segregation Authority the same as CSA Partners?

Its own site, costsegauthority.com, now presents the business under the name CSA Partners as of October 2026. This page treats them as the same company based on that public branding and will update if the naming changes again.

Do I need a CPA firm to work with Basis?

No. Basis works directly with commercial and short-term rental owners. A CPA still prepares and files the return, including any Form 3115 for a look-back study, but no referral or existing CPA relationship is required to start the process.

Does Basis serve large commercial developers?

Basis is weighted toward individual commercial and short-term rental owners rather than large developer portfolios. A firm with 20-plus years serving developers may fit a large developer's needs better than a single-property-focused shop.

What does the Basis guarantee cover?

Every study identifies at least 20 times its fee in first-year deductions on commercial property, or at least 30 times on a short-term rental, or the study is free. That floor applies to both the budget and full engineered tiers equally.

Keep reading