03 — Tools / ROI Calculator
Mezzanine ROI calculator
One-time mezzanine cost versus rent that never stops versus a building addition — find the crossover year for your numbers, with published 2026 defaults you can override.
4,000 sq ft over 10 years
Mezzanine
$295,000
one-time $280,000 + upkeep
Lease
$584,658
cumulative rent + CAM
New construction
$560,000
capital only, 6–18 mo timeline
The mezzanine passes cumulative lease cost in year 6 of your occupancy window.
| Year | Lease cumulative | Mezzanine cumulative |
|---|---|---|
| 1 | $51,000 | $281,500 |
| 3 | $157,636 | $284,500 |
| 5 | $270,766 | $287,500 |
| 7 | $390,786 | $290,500 |
| 10 | $584,658 | $295,000 |
Simple cumulative-cost comparison — no discounting, tax treatment, or moving costs. It answers “when does the mezzanine pass the lease?”, not “what is the NPV?” — bring the output to your finance team for the full model.
Methodology — where the defaults come from
The $70/sq ft mezzanine default is the published industry median inside the $50–150 range documented in our cost guide; the $10.20/sq ft lease default is Cushman & Wakefield's Q1 2026 national average asking rent (CBRE and JLL publish $11.08 and $10.34 — adjust to your market), with CAM modeled at 25% of base and 3% annual escalation; the $140/sq ft construction default sits in the published $85–200 turnkey range for mid-size buildings. All sources are cited in the three-way cost comparison and the ROI framework. Price the mezzanine input precisely with the cost calculator.
Frequently asked questions
How fast does a mezzanine pay for itself?
At typical published rates — roughly $70 per square foot installed against a $10-plus lease with CAM — a mezzanine passes the cumulative cost of leasing equivalent space in roughly five to seven years, faster in expensive lease markets. Run your own numbers; the crossover year is the answer that matters.
Is a mezzanine cheaper than leasing more space?
Over short horizons, leasing usually wins because it avoids the capital outlay. Over five-plus years of occupancy, the one-time mezzanine cost typically beats rent that compounds with escalation and CAM — which is why occupancy horizon is the single most important input.
Is a mezzanine cheaper than building an addition?
Almost always on capital: published 2026 figures put turnkey warehouse construction at $85–200 per square foot versus $50–150 for a mezzanine — and the timeline gap is months versus weeks. Construction wins only when you need things a mezzanine can't add, like docks, yard, or utilities.
What defaults does this calculator use?
Published 2026 figures: $70 per square foot installed mezzanine cost (the industry median), a $10.20 national average asking rent with 25% CAM and 3% annual escalation, and $140 per square foot turnkey construction for a mid-size building. Every default is editable.
Does this include taxes, depreciation, or NPV?
No — deliberately. It's a transparent cumulative-cost comparison that answers when the mezzanine passes the lease. Discounting, Section 179 treatment, and financing belong in your finance team's model; this gives them clean inputs.