Tenant Mix Modelling
Executive Summary
Key Takeaways
- ✓ Tenant mix, the composition of tenants by category, size, and covenant strength, is a value and risk driver independent of any individual lease's own specific terms, and should be modelled as its own explicit schedule.
- ✓ Co-tenancy dependency, where surrounding tenant rent or occupancy is contractually or commercially linked to an anchor tenant's continued presence, should be represented explicitly given its potential to compound a single tenant event into a wider income impact.
- ✓ Tenant concentration risk, measured by income share attributable to any single tenant or tenant category, should be reported as its own summary metric, distinct from and in addition to lease-by-lease rent roll detail.
- ✓ A well-diversified tenant mix by category and covenant strength reduces the asset's sensitivity to any single tenant or sector-specific downturn, and this diversification (or its absence) should be visible to a reviewer as a quantified metric, not left implicit in the underlying lease data.
- ✓ Tenant mix modelling applies most directly to retail and, to a lesser extent, mixed-use and office assets with multiple significant tenants; it is less relevant to a genuinely single-tenant industrial or logistics asset, where concentration is total by definition.
Institutional Definition¶
Tenant mix, the composition of tenants by category, size, and covenant strength across a multi-let asset, is a value and risk driver independent of any individual lease's own terms, and should be modelled as its own explicit schedule and summary metric rather than left implicit in the underlying lease data. This extends the tenant mix treatment introduced in Retail Real Estate Model Structure to its general modelling methodology.
Tenant Category Schedule¶
Tenants should be classified and tracked by category (for retail, commonly food and beverage, fashion, homeware, services, and similar; for office, by industry sector where material), size, and covenant strength, maintained as its own schedule alongside the lease-level rent roll. This schedule is what allows a reviewer to assess whether the asset's income is well-diversified across categories or concentrated in a way that increases sensitivity to a single category's downturn.
Co-Tenancy Dependency¶
Where surrounding tenant rent or occupancy rights are contractually or commercially linked to an anchor tenant's continued presence, commonly through a co-tenancy clause, this dependency should be modelled explicitly. A single anchor tenant vacating can trigger reduced rent or termination rights across multiple surrounding leases simultaneously, compounding a single tenant event into a wider income impact that a lease-by-lease view, without an explicit co-tenancy link, would not capture.
Concentration Risk Reporting¶
Tenant concentration risk, income share attributable to any single tenant or tenant category as a percentage of total scheme income, should be reported as its own summary metric, distinct from and in addition to lease-by-lease rent roll detail. This allows a reviewer to assess concentration risk directly rather than manually aggregating it from individual leases, and to compare the asset's diversification against a stated risk tolerance or lender covenant.
Applicability by Property Type¶
Tenant mix modelling applies most directly to retail and, to a lesser extent, mixed-use and office assets with multiple significant tenants. It is less relevant to a genuinely single-tenant industrial or logistics asset, where income concentration is total by definition rather than a function of tenant composition choices.
Common Structural Errors¶
No explicit tenant category schedule. Relying only on lease-by-lease rent roll detail without a category-level summary conceals concentration risk that exists independently of individual lease terms.
Unmodelled co-tenancy dependency. Omitting co-tenancy clauses from the model understates how a single anchor tenant event could compound into a wider income impact.
Missing concentration risk metric. Failing to report income share by tenant or category as a standalone metric leaves concentration risk implicit rather than quantified.
Audit Checks¶
Category schedule check. Confirm a tenant category, size, and covenant schedule exists alongside the lease-level rent roll.
Co-tenancy linkage check. Confirm any co-tenancy clauses are explicitly modelled and linked to the relevant anchor tenant.
Concentration metric check. Confirm income concentration by tenant and category is reported as an explicit summary metric.
Best Practices¶
| Best Practice | Why It Matters |
|---|---|
| Maintain an explicit tenant category, size, and covenant schedule | Surfaces mix-driven value and risk independent of individual lease terms |
| Model co-tenancy dependency explicitly where it exists | Represents the true compounding impact of a single anchor tenant event |
| Report tenant and category income concentration as a standalone metric | Makes concentration risk directly assessable, not manually aggregated |
| Scope tenant mix modelling to property types where it is genuinely relevant | Avoids applying a multi-tenant framework where concentration is structurally total |
Further Reading¶
- International Council of Shopping Centers (ICSC), research publications on retail leasing structures
- RICS, Valuation — Global Standards (Red Book), Royal Institution of Chartered Surveyors
Continue Reading¶
Prerequisites¶
- Real Estate Financial Modelling — the parent pillar
- Retail Real Estate Model Structure
Related Technical Guides¶
Related Products¶
How OXXON tests thisRun a free structural check with FMAE
Frequently Asked Questions
What is tenant mix, and why does it matter beyond individual lease terms?
The composition of tenants occupying a multi-let asset by category, size, and covenant strength. It matters independently of individual lease terms because an imbalanced mix, too much concentration in one category, or excessive reliance on a single anchor, is itself a value and risk driver that a lease-by-lease rent roll alone does not surface.
How should co-tenancy dependency be modelled?
Explicitly, representing the contractual or commercial link between an anchor tenant's continued presence and surrounding tenants' rent or occupancy rights, given its potential to compound a single anchor tenant event into a wider portfolio income impact that a lease-by-lease view would not otherwise capture.
How should tenant concentration risk be reported?
As its own summary metric, income share attributable to any single tenant or tenant category as a percentage of total scheme income, distinct from and in addition to lease-by-lease rent roll detail, so a reviewer can assess concentration risk at a glance rather than aggregating it manually from individual leases.
Does tenant mix modelling apply to every property type?
It applies most directly to retail and, to a lesser extent, mixed-use and office assets with multiple significant tenants. It is less relevant to a genuinely single-tenant industrial or logistics asset, where concentration is total by definition rather than a function of tenant composition.
What is the risk of not modelling tenant mix explicitly?
A reviewer relying only on lease-by-lease detail may not readily see that the asset's income is disproportionately concentrated in one tenant category or dependent on a single anchor tenant's continued presence, understating the asset's true sensitivity to a single-tenant or single-sector event.
Related Articles
Retail Real Estate Model Structure
Retail models specialize the income-producing asset structure around turnover rent mechanics, where a portion of rent is contingent on tenant sales performance, and tenant mix, where anchor tenant covenant strength and footfall contribution materially affect the value of surrounding smaller units. This guide sets out how turnover rent should be modelled, how tenant mix and anchor covenant risk should be represented, and how service charge recovery feeds the NOI build.
Commercial Office Model Structure
Commercial office models specialize the income-producing asset structure around lease-level detail — individual lease terms, rent review and break clause mechanics, and a weighted average unexpired lease term (WAULT) that summarizes portfolio lease risk. This guide sets out how the rent roll should be built, how rent reviews and break options should be tested, and how void and re-leasing costs should be modelled at each lease event.
Lease Modelling Mechanics
Every lease within a real estate rent roll carries a set of terms beyond the headline rent figure that materially affect cash flow: a free rent or incentive period at the start of the term, a tenant improvement allowance funded by the landlord, and any renewal or early termination options the tenant holds. This guide sets out how each of these lease-level mechanics should be modelled explicitly rather than netted into a simplified effective rent figure.