The default answer was 39 years.
Buy this kind of property and the IRS starts from one assumption: the whole thing is a single asset, written off over 39 years. For a $700,000 office property in East Peoria, that path would have handed back the owner's deductions in thin, even slices, about $18,000 a year, for decades.
Nothing is wrong with that schedule. It is a starting point, not a verdict. The tax code, through the Modified Accelerated Cost Recovery System, never actually calls a building one asset. It calls a property a stack of assets, each with its own life. The shell earns the long schedule. The site around it, the systems inside it, do not.
Read the property the first way and your money sits still for 39 years. Read it the second way, the way the code allows, and a real share of it goes to work now. On a property of this size, the distance between those two readings is not small change.
An office building is the build-out, not just the box.
An office property starts on a 39-year schedule, but the interior build-out, the data and specialty power, and the site around the building carry much shorter tax lives.
The Cost Seg America team analyzed this property the way the two engineering approaches the IRS ranks highest call for: component by component, across the whole property. Not a questionnaire, not a software estimate that runs the address through a template and returns an average. An actual engineering analysis of the structure, the site work, and the systems that a cheaper study never bothers to separate.
What an engineered study looks for in a property like this
- Interior build-out and finishes, including non-structural improvements built for the tenant.
- Data, communications, and specialty electrical serving equipment rather than the base structure.
- Qualified Improvement Property: interior, non-structural improvements made after the building was placed in service, carrying a 15-year life.
- Site work: parking, drives, walkways, landscaping, and site lighting.
The result: $394,622, roughly 56% of the property's basis, was identified as shorter-life property and moved off the 39-year schedule into faster federal depreciation. That is not an estimate or a projection. It is what an engineered analysis documented on this building, to the standard the IRS publishes for its own examiners in the Cost Segregation Audit Techniques Guide.
Deductions are worth more now than later.
A study like this does not conjure deductions out of thin air. Every dollar of that $395K always belonged to the owner. The study simply pulled those deductions forward, out of the distant future and into the present, where each one carries more weight.
The logic is plain. A dollar deducted this year beats a dollar deducted in 2050, because this year's dollar can go back to work, into the next deal, into the business, into anything that earns. Inflation chips away at the far-off deduction; time value rewards the near one. Moving $395K forward is an interest-free head start the code hands out on purpose.
And the timing has rarely been better. Under the One Big Beautiful Bill Act, signed July 4, 2025, 100% bonus depreciation is now permanent for qualifying property placed in service after January 19, 2025. The shorter-life property an engineered study pulls out is exactly what qualifies, so reclassified value like this can land as a first-year deduction instead of leaking out over decades.
What accelerating $395K is worth.
Reclassifying property is only half the story. The other half is what those accelerated deductions are worth once they are working for you now instead of decades from now. The figures below are illustrative, calculated from this study's real reclassified amount using the assumptions shown.
Illustrative first-year federal tax benefit: $146,010. Illustrative 10-year net present value of accelerating: $120,889.
Illustrative only, not a promise of results. First-year benefit assumes the $395K of reclassified property is deducted in year one under 100% bonus depreciation (permanent under the One Big Beautiful Bill Act for qualifying property placed in service after January 19, 2025) at a 37% federal tax rate. Net present value compares taking those deductions now versus the default schedule, discounted at 8% over 10 years. Federal figures only. Your actual benefit depends on your tax situation; your CPA determines what applies to you.
What owners ask about a result like this.
Could a study like this be done on a building I bought years ago?
Yes. A look-back study reaches properties bought, built, or renovated as far back as ten years. Your CPA files one form, Form 3115, with the regular return, and the depreciation you should have taken already comes back as a single catch-up deduction this year, figured as a Section 481(a) adjustment. No amended returns, no reopened years.
Does a reclassification like this invite an audit?
Cost segregation is a recognized, IRS-documented practice with its own examiner guide, Publication 5653. If a return is examined, what carries the day is the quality of the study behind it. Every Cost Seg America study is built on the two engineering approaches that guide ranks highest, and the team's work has cleared more than 125 IRS audits with zero losses and nothing returned.
What happens to these deductions when the property sells?
Depreciation figures into a sale whether or not a property was cost segregated, and your CPA plans for it. For owners who hold for years, the value of large deductions taken now generally outweighs the treatment at sale, and a 1031 exchange can defer it. It is a planning matter, never a reason to leave the deductions unclaimed.
Would my building reclassify the same 56%?
Not necessarily. The share that reclassifies turns on how the building was built and fitted out and how much site work surrounds it, which is why results vary widely. The only way to know your figure is an engineered analysis, and a free proposal will estimate it before you spend anything.
An engineered cost segregation study on an East Peoria, IL office property reclassified $394,622 (56%) of a $700,000 basis into faster federal depreciation. Engineered, not estimated, by the Cost Seg America team.