In a gross lease, the tenant pays a single fixed rent and the landlord absorbs all operating costs: property taxes, insurance, maintenance, utilities, and common area expenses. The tenant's obligation is straightforward: one monthly cheque, no exposure to operating cost fluctuations.
The landlord's obligation is equally straightforward but carries the risk: if property taxes or insurance premiums rise unexpectedly, the landlord absorbs the increase without the ability to pass it through mid-term. Gross leases are most common in older multi-tenant office buildings, some industrial markets, and properties where tenants have insufficient bargaining power or sophistication to absorb operating exposure.
The modified gross lease, the structure most frequently encountered in office markets, is a hybrid. The tenant pays a base rent plus their proportionate share of specified operating expense categories, often above a base year stop or an expense cap.
A base year stop means the landlord covers operating expenses up to the first year of the lease; if expenses rise above that base year level in subsequent years, the tenant pays their share of the increase. This structure gives the landlord protection against inflation in operating costs while leaving the tenant with predictable baseline exposure.
From the landlord's perspective, gross leases require more active budget management than net leases. Because operating expenses are landlord-borne, the property's NOI is net of those costs rather than gross revenue.
A landlord underwriting a gross lease building must model realistic operating cost inflation, especially for energy, labour, and insurance, which have historically grown faster than CPI. Underestimating operating costs in a gross lease building compresses actual NOI relative to underwritten NOI, creating a value gap that materializes at refinancing or disposition.
The tenant evaluating a gross lease faces a different analysis than one evaluating a net lease. The all-in rent in a gross lease looks higher than the base rent on a comparable net lease property, but the net lease tenant must add their pro-rata operating expenses to get to the true occupancy cost.
Comparing gross and net lease options requires converting both to a total occupancy cost basis (gross rent versus net rent plus estimated operating expenses) before a valid comparison is possible. Tenant representatives use this translation regularly when presenting options to occupier clients across buildings with different lease structures.
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