Detroit real estate has drawn a fresh wave of investors, and many of them are holding industrial buildings, apartment properties, and offices that depreciate far more slowly than the tax code allows. A cost segregation study speeds that up by breaking a building into the components that qualify for shorter recovery periods. Picking the right cost segregation company in Detroit is what determines whether the study survives a later look from the IRS or crumbles under one.
As co-founder of Seneca Cost Segregation and a real estate investor myself, I have gone through plenty of Michigan studies that other firms delivered. What we find on Detroit properties is that the reports owners can least defend are the ones where nobody ever inspected the building, only a spreadsheet and a rate assumption.
My aim here is to help you compare Detroit providers on the quality of the work itself. I cover why owners are revisiting their schedules, how a study reworks the math, which local buildings benefit most, the Michigan wrinkle at the state level, and what a study costs.
TL;DR — Detroit Owners, Start Here
- ●Meaningful basis moves: A study commonly shifts a fifth to a third of a Detroit commercial building’s depreciable basis into 5, 7, and 15-year property.
- ●Full bonus is permanent again: Qualifying property acquired and placed in service after January 19, 2025 writes off the reclassified amount in year one federally.
- ●Michigan has stepped away: The state decoupled from the federal bonus rules in 2025, so the immediate deduction is federal while Michigan follows a standard schedule.
- ●Industrial stock reclassifies hard: Detroit’s manufacturing and warehouse buildings carry heavy site work and power, which pushes the percentage up.
- ●Budget $3,000 to $15,000: Residential at the low end and standard commercial higher, with most reports done in 2 to 4 weeks.
- ●A past purchase still counts: A look-back study claims missed depreciation on Form 3115 this year with no amended returns.
- ●Vet on one thing first: Confirm a licensed engineer inspects the building and puts a name on the report.
Why Detroit Owners Are Revisiting Their Depreciation
Two things have owners across the metro taking another look at how their buildings depreciate.
Values in and around the city have moved after a long stretch of low prices, so more owners now hold buildings large enough to make a study worthwhile. At the same time, the federal write-off on a recent purchase is the most generous it has been in years, which changes the calculus on anything bought since early 2025.
Redevelopment across Detroit adds another angle, because renovated and repositioned buildings carry fresh components that a study can pick up. An owner who put real money into a rehab often has more reclassifiable basis than the purchase price alone would suggest.
How a Cost Segregation Study Reworks the Schedule
A building lands on your books as one depreciable figure, spread over 39 years for commercial or 27.5 for residential rental, and that single figure ignores what the structure actually contains.
Equipment wiring, decorative finishes, cabinetry, flooring, parking, fencing, and landscaping carry shorter lives under the schedules in IRS Publication 946. A study finds those pieces, prices them, and records why each one belongs in a 5, 7, or 15-year class.
Your total deduction over the life of the building does not grow. The timing shifts toward the early years, and for an owner recycling capital into the next Detroit deal, earlier cash carries real value.
The Detroit Buildings Where It Pays Most
How much reclassifies depends on how much machinery, wiring, and site work a building holds, so the answer runs by property type.
Manufacturing plants and warehouses tend to top the list around Detroit, given how much of their cost lives in process power, reinforced slabs, dock equipment, and paved yards. Apartment buildings do well on appliances, unit finishes, cabinetry, and the parking and landscaping that surround them. Offices and retail come in lower, shaped mainly by the depth of the tenant build-out.
One Detroit-specific factor deserves attention: the land allocation. Wayne County assessment splits do not always match economic reality, and since land cannot be depreciated, we test that split rather than take it at face value.
The Federal Bonus Rule, and Michigan’s Departure From It
The federal rules and the Michigan rules point in different directions right now, and the gap matters for how you plan.
On the federal side, the One Big Beautiful Bill, P.L. 119-21, permanently restored 100% bonus depreciation for qualifying property acquired and placed in service after January 19, 2025, per IRS Notice 2026-11. Acquisition date is fixed by the binding written contract, so a building purchased under contract after that date can deduct the full reclassified amount in year one.
Michigan went the other way. The state decoupled from federal bonus depreciation in 2025 legislation, according to the Michigan Department of Treasury, so property expensed in full federally is added back and depreciated on the state return.
Questions That Separate Detroit Providers
Two firms can quote the same building and reach different results, and the difference is almost always method rather than talent. These questions expose it.
- ●Will an engineer actually inspect the property. The IRS Cost Segregation Audit Techniques Guide holds up the engineering approach, grounded in records and a site visit, as the most reliable. A desk study built from a form is a thinner thing.
- ●Is audit defense already covered. Standing behind the classifications should be part of the price rather than an extra invoice if the return is ever questioned.
- ●Whose name is on the classifications. An engineer willing to sign is accepting responsibility, which is what gives the report weight.
- ●Can they justify a big headline figure. A reclassification well above the others on the same building deserves an explanation and supporting detail before you trust it.
At Seneca, Here Is How a Detroit Study Runs
Our approach looks the same on a Detroit plant as on any building we take on, and it begins before you spend a dollar.
- ●No-cost feasibility check. We size up the property type, price, land split, placed-in-service date, and your tax situation, then send back an estimated range and a set fee. If a study will not clear its cost, we tell you plainly.
- ●Paperwork gathering. Your closing statement, current depreciation schedule, appraisal, and any construction or rehab records.
- ●Building walk-through. An engineer documents and photographs the components that drive the numbers, including the exterior and site work owners tend to forget.
- ●Costing and classification. Every component gets a price and a recovery period backed by the Audit Techniques Guide standards.
- ●Head of Engineering review. Every study passes our Head of Engineering before a client ever sees it.
- ●Report and CPA coordination. You receive the deliverable and the schedules your accountant needs, Michigan figures included, and we work with them through the filing.
A residential or standard commercial study runs 2 to 4 weeks. Complex commercial work, meaning hotels, manufacturing plants, and larger portfolios, runs 4 to 8 weeks. When a study slips, late documents are almost always the reason rather than the engineering.
What a Study Costs and When It Earns Its Fee
Fees follow how involved a building is rather than what it sold for, which is why two Detroit properties at the same price can price out differently.
Residential studies usually cost $3,000 to $5,000. Standard commercial falls between $5,000 and $15,000, and complex commercial climbs to $10,000 to $20,000 or higher. The strongest returns appear on commercial property holding at least $1,000,000 in depreciable basis, while residential and short-term rentals typically justify a study from around $250,000 to $500,000.
Some scenarios pull the other way even when the arithmetic looks strong. A near-term sale can bring recapture that undoes the timing gain, passive activity rules can shelve losses you cannot use yet, and a low effective rate limits the payoff from acceleration. Confirm all projections with your CPA before making financial decisions, because a deduction is only worth what it saves against your own return.
Frequently Asked Questions
Below are the questions Detroit owners bring up most as they line up providers.
Why Owners Choose Seneca
Our engineers work under our own roof rather than through subcontractors, our Head of Engineering reviews every study before it goes out, and audit defense is part of the engagement instead of a later charge. The record below reflects how carefully each study is assembled.
Conclusion
The value of a study shows up twice: once in the first-year deduction, and again years later if an examiner asks how the numbers were built. A file with an engineer and a site visit behind it answers that question easily.
Detroit owners are looking at a favorable stretch. Federal bonus depreciation sits at 100% for qualifying purchases after January 19, 2025, and even with Michigan decoupling from that treatment, a study on a recent building turns into a substantial first-year federal deduction.
Whichever company you pick, ask who inspects the building and who signs the report. If you want a feasibility read on a Detroit property, or you prefer to run your own numbers through the calculator first, both are fast and free to start.
- Notice 2026-11, Additional First Year Depreciation Deduction (irs.gov)
- Cost Segregation Audit Techniques Guide, Publication 5653 (irs.gov)
- Publication 946, How To Depreciate Property (irs.gov)
- Michigan Department of Treasury (michigan.gov)
