20-Unit Apartment Cost Segregation: Feasibility, Components and Timing
By AE Tax Advisors · Published 2026-08-10 · Updated November 8, 2026.
A 20-unit apartment property can justify a cost segregation review, but unit count alone does not prove the study will pay for itself. Compare the likely timing benefit with fees, available records, owner tax limits and the expected holding period.
Reconcile the acquisition basis
Separate land from depreciable property and identify acquisition costs that belong in each category. Review existing depreciation, prior improvements and the service date. Do not apply a fixed reclassification percentage to the entire purchase price.
Inventory unit and common-area assets
Collect appliance, furnishing, laundry, office and amenity schedules. Flooring, cabinets, lighting and utility work need classification based on their actual function and installation. A repeated item across 20 units still requires a supported unit cost and correct asset treatment.
Review the site separately
Surface paving, fences, drainage and site lighting can differ from building components. Carports and parking structures require their own facts. Keep shared site costs distinct from land and avoid counting the same cost in several buildings.
Plan renovation and replacement records
If renovations are expected, preserve original asset information before removal. Evaluate acquisition assets, later improvements and any eligible partial disposition separately. Two studies are not automatically necessary; compare the useful deliverables and costs of the proposed approach.
Model the usable deduction
Test original bonus eligibility and first-year conventions, then apply relevant basis, at-risk and passive-activity limits. Real estate professional status alone does not resolve every limitation. Consider state depreciation and sale recapture before treating acceleration as permanent savings.
Book a Cost Seg Discovery Call with closing records, rent rolls, fixed-asset schedules and renovation plans.
Frequently Asked Questions
Does owning 20 units guarantee the study is worthwhile?
No. Compare supported deductions, fees, loss limits and holding period.
Should I always commission separate acquisition and renovation studies?
No. Determine which records and deliverables are needed and compare the costs.
Sources and review notes
Reviewed November 8, 2026 by AE Tax Advisors. Examples are illustrative; apply the rules to the relevant tax year and records. See our editorial policy.