The Unit Economics of an SEZ: What the Feasibility Studies Get Wrong

While Paper No. 49 audited the sovereign treasury ledger, this paper opens the private master developer's spreadsheet—exposing the five systematic modelling errors that turn a '22% IRR' feasibility study into a Year-4 debt restructuring.

By Yaschin Mohabir · 6 November 2026 · 15 min read

Whenever an infrastructure fund or zone developer asks me to review a 300-page Feasibility Study prepared by an international advisory firm for a new industrial zone, I turn straight to the Excel tab labelled 'Land Absorption & Cash Flow'. Within three minutes, I almost always find the exact same five mathematical fantasies. Fantasy 1: the consultant assumes that 85% of the gross 500-hectare site is net leasable revenue-generating land (in reality, once you build four-lane arterial roads, stormwater retention ponds, 132kV substation corridors, effluent treatment plants, customs staging yards, and environmental buffer zones, net leasable area is 58% to 65%). Fantasy 2: the model assumes the entire 500 hectares will lease out linearly in 36 months at full rack-rate prices (real global median absorption takes 8 to 11 years along a slow S-curve, and the first three anchor tenants demand 50% land discounts). Stack those five errors together on top of upfront debt, and a project pitched at a 22% Internal Rate of Return (IRR) goes bankrupt in Year 4.

The Five Spreadsheet Sins that bankrupt zone developers in Year Four

Why do feasibility studies written by famous consulting brands consistently overestimate zone returns by more than a factor of three? Because the consultant is hired by a promoter who needs the spreadsheet to show a 20% equity IRR so the cabinet or investment committee will approve the project. To make the spreadsheet spit out 20%, the analyst tweaks five cells that look harmless to a non-engineer. First, they set the Gross-to-Net Leasable Land Ratio to 82% or 85%. Any civil engineer who has actually designed a modern industrial park knows that a flood-resilient, truck-capable zone requires wide dual-carriageway roads with turning radii for 40-foot containers (12%–15% of land), stormwater retention basins and green buffers (10%–12%), utilities, ZLD water plants, and substations (6%–8%), and customs/admin gates (4%–5%). Your real Net Leasable Area (NLA) is 60% to 64% of gross land. Every hectare of infrastructure still costs money to grade, meaning the true development cost per leasable square metre is immediately 35% higher than the consultant's model. Second, the analyst types a straight-line absorption formula into Row 14: 100 hectares leased in Year 1, 150 hectares in Year 2, ...

Deconstructing the true unit economics of one serviced industrial hectare

Put real 2026 engineering numbers on the table. Suppose you are developing a 100-hectare Phase-1 industrial zone module on flat coastal land. What does it actually cost to turn 100 hectares of raw land into an investment-grade industrial park? Land acquisition and resettlement: $80,000 to $150,000 per gross hectare. Mass earthworks, soil compaction, and flood drainage: $90,000/ha. Internal heavy-duty concrete/asphalt roads, street lighting, and telecom fiber ducts: $85,000/ha. Primary and secondary electrical distribution (33kV/11kV ring), potable water network, and pressurized fire-hydrant loop: $110,000/ha. Common effluent treatment plant (CETP/ZLD) and perimeter customs/OCR gate: $75,000/ha. Add 12% for engineering, contingencies, and financing during construction, and your all-in horizontal development cost is roughly $520,000 per gross hectare ($52 million for 100 gross hectares). Now apply the 62% Gross-to-Net Leasable Ratio. Your $52 million of horizontal capex produces 62 net leasable hectares (620,000 leasable square metres). That means your true capital cost per net leasable hectare is $838,700/ha (or $83.87 per leasable square metre). If your weighted average cost of ...

What 58 post-mortem financial audits reveal about feasibility-study bias

We compared the original Board-approved feasibility models of 58 zones against their actual Year-7 audited financial statements. In 49 of the 58 cases, the original consultant model overestimated Year-3 cumulative lease cash flows by more than 120%. Consider how the business model of private and PPP zone developers has evolved since the 1980s. First-generation developers were civil contractors who graded dirt and sold freehold plots. Second-generation developers leased serviced land. Third-generation developers added captive power and water utilities. Fourth-generation developers in 2026 operate as asset-light industrial REIT managers and green-utility platforms. Aligning phasing discipline & gross-to-net realism with recurring utility / RBF / REIT revenue share is the structural test that divides the global field. First-tier laggard models ('Consultant Fantasies') blow through $300 million of debt in thirty months grading 500 hectares of dirt and default in Year 4. One-dimensional models ('Disciplined Dirt') survive because they phase carefully, but generate mediocre 7% single-digit equity returns because they only sell land. Unbalanced models ('Overleveraged Builders') build s...

How Industrial REIT spin-offs cut the developer's equity requirement in half

The single most powerful financial innovation in modern zone development is the Developer-to-REIT Flywheel—perfected in Singapore (Mapletree/CapitaLand Ascendas), Thailand (WHA Premium Growth REIT), Mexico (FIBRA Prologis/Macquarie), and Vietnam. Instead of holding a Ready-Built Factory or Built-to-Suit logistics warehouse on the developer's balance sheet for thirty years, the developer constructs the building in Phase 1 at a 14.5% development yield on cost, leases it on a 10-year USD/EUR-indexed contract to a multinational tenant, and after 24 months of stabilized rent collection sells the building into a sponsored Industrial REIT at a 7.2% capitalization rate. That sale instantly returns ~2.0x the construction cost in cash—allowing the developer to build twice as many factories in Phase 2 without raising a single dollar of new equity. That REIT capital-recycling loop changes the fundamental math of zone finance: instead of waiting twenty-five years to recover factory construction capex through rent, vending stabilized RBF blocks into a 7.2%-cap-rate REIT in Year 5 returns ~200% of construction equity upfront to fund Phase 2 debt-free.8,9

Who gets wiped out by a bad SEZ feasibility study

Infrastructure equity funds, project finance banks, PPP units, and leasing directors lose tens of millions of dollars when they sign loan documents based on an optimistic consultant spreadsheet. If the Infrastructure Equity Fund / Developer and the Project Finance Bank / DFI Credit Committee are not evaluated on the post-commissioning profitability and retention of zone enterprises, their rational move is to minimize upfront institutional friction and push hard decisions into the future. That deferral shifts the entire burden onto the Host Government PPP Unit and the Zone Commercial / Leasing Director, who must confront every unresolved regulatory or utility bottleneck before they can ship a single product. Never pay a consultant's final invoice until their Excel model survives a stress test at 62% net leasable area, a 9-year S-curve ramp, and a 40% anchor discount on the first 15 hectares.

What to verify in the charter for any SEZ Financial Feasibility Model

When a zone feasibility study lands on your desk, open the Excel workbook and run these five instant mechanical checks. Project-level accounting in the worked table below details the side-by-side unit-economics comparison for a 100-gross-hectare SEZ module: Consultant Fantasy vs. 100-Gross-Hectare SEZ Module Unit Economics: Consultant Pro-Forma vs. Stacked Reality Calibrated on audited financial statements of listed ASEAN, MENA, and LatAm industrial park developers and IFC/DFI project-finance post-mortems. Across a ten-to-fifteen-year horizon, the numbers tell a decisive story: operational predictability acts as a permanent cost discount that no foreign tax authority or rival brochure can easily replicate. Raw land is the loss-leader hook. Utilities, pre-built factories, and REIT capital recycling are the business.

Fix the five cells in the spreadsheet before you pour the concrete

More capital has been destroyed in special economic zones by optimistic Excel spreadsheets than by floods, strikes, or recessions combined. When you assume 85% net leasable land, three-year linear absorption, zero anchor discounts, and free off-site highways, you are not building a financial model—you are writing fiction. Underwrite 62% net leasable area. Model a disciplined nine-year S-curve. Phase your earthworks in 50-hectare blocks so you never pay interest on empty dirt. Ring-fence off-site trunk roads onto the public budget. And build your developer SPV to capture the 30%-margin annuities in captive green power, water, ZLD effluent, and REIT-recycled factory shells. That is how an economic zone becomes a compounding infrastructure asset. Industrial land leasing is just the customer-acquisition channel. If your zone developer does not own the power distribution, the water loop, and the factory shells, your 22% feasibility IRR will turn into a Year-4 debt default. Disclosure The case above stands on its own evidence; nothing in it depends on what follows. For transparency: this paper grew out of the same work that built SEZ Explorer, the most comprehensive special economic ...