Multifamily & Apartment Buildings
Cost Segregation for Apartments and Multifamily Property
Multifamily is one of the property types where cost segregation performs most consistently. More units means more repeated components, and repeated components mean more square footage of flooring, cabinetry, and fixtures that never belonged in a 27.5-year depreciation bucket in the first place.
What Typically Qualifies in a Multifamily Building
Cost segregation apartments studies work by walking through every component of a building and asking a simple engineering question: does this item's actual useful life match the 27.5 years the IRS assumes for the structure as a whole, or does it genuinely wear out and get replaced much sooner? In a typical apartment building, a substantial list of components answers "much sooner."
- In-unit appliances: refrigerators, ranges, dishwashers, in-unit washers and dryers
- Flooring that isn't part of the structural subfloor: carpet, vinyl plank, and similar finish flooring
- Cabinetry and countertops in kitchens and bathrooms
- Certain interior finishes, window treatments, and specialty lighting fixtures
- Parking lot paving, striping, and lighting
- Landscaping, irrigation systems, and fencing
- Common-area fixtures: clubhouse or leasing office finishes, fitness center equipment, pool decking and equipment where present
Multiply any one of these across a building with dozens or hundreds of units, and the dollar value adds up quickly relative to a single-family rental with the exact same component list per unit.
Why Unit Count and Building Age Both Matter
Two variables move the needle most in a multifamily cost segregation study: how many units the building has, and how old the building is.
Unit count matters because the reclassifiable components, appliances, flooring, cabinetry, are largely repeated per unit. A 60-unit building doesn't just have more total value than a 6-unit building, it has proportionally the same or often a larger share of its total basis sitting in these short-life categories, since larger properties frequently include more shared amenity space (clubhouses, fitness centers, expanded parking and landscaping) that adds its own reclassifiable components on top of the per-unit totals.
Building age matters differently. A newer building's original construction costs are well documented, which tends to make the engineering allocation more precise and often more favorable. An older building that's had renovations along the way may have a mix of original 1980s-era construction and more recent, better-documented capital improvements, both of which a study accounts for, but the process typically requires more careful reconstruction of costs for the original components.
A Worked Example
Here's the same $2,400,000 apartment building example used elsewhere on this site, walked through with multifamily-specific detail. Assume the $2,400,000 depreciable basis reflects a mid-size apartment building, residential rental property depreciated over 27.5 years, with the building acquired after January 19, 2025 so any reclassified components qualify for 100% bonus depreciation.
| Scenario | First-Year Deduction |
|---|---|
| Standard straight-line depreciation (27.5 years) | $87,273 |
| With cost segregation ($480,000 in 5-year property: appliances, flooring, and cabinetry across units; $240,000 in 15-year property: parking lot, landscaping, and site improvements, both at 100% bonus depreciation) | $781,091 |
| Additional first-year deduction | $693,818 |
Notice the split behind that $781,091 figure: $480,000 of the basis, roughly 20% of the total, reflects the sum of appliances, flooring, and cabinetry repeated across every unit, while $240,000 reflects the parking lot, landscaping, and other site improvements that serve the property as a whole. That 5-year and 15-year split is fairly typical for multifamily, though the exact percentages shift with unit mix, finish quality, and how much amenity space the property includes.
The additional $693,818 in year-one deductions doesn't change how much this owner will depreciate over the life of the property, it changes when. For an owner who can use that deduction against current income, it means a substantially lower tax bill in the first year of ownership. Read Is Cost Segregation Worth It for the decision framework and calculator to see whether that timing advantage is worth it for your specific building, and see how these numbers play out over a multi-year hold in our guide for real estate investors.
Why Multifamily Tends to Perform Consistently
Not every property type produces a favorable outcome, and this site is deliberately upfront that cost segregation isn't universally worth it. Multifamily property is one of the more consistently favorable categories precisely because the component mix described above shows up in nearly every apartment building, regardless of exact architecture or era. Office buildings vary enormously in interior buildout. Retail varies by tenant. Apartments, across a wide range of building styles, tend to share the same core list of short-life components: units full of appliances and finish materials, and shared grounds full of paving and landscaping.
- A depreciable basis in the high six figures or above
- Multiple units, meaning repeated per-unit components
- A hold period of several years or more
- An owner in a position to use the resulting deduction against current income
A small multifamily property, a duplex or triplex with a modest purchase price, may not generate enough reclassified value to clearly justify a study fee. And as with any property, the accelerated depreciation is subject to recapture at sale. A specific estimate for your building, not a generic percentage, is the only way to know where your property actually lands.
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Educational content only. Not tax, legal, or accounting advice. See our full disclosures.