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    Commercial Lease Types: Gross, Modified Gross & NNN Compared

    Pick the wrong structure and you'll overpay for years. Here's how each lease type actually works.

    Every commercial lease sorts into one of three families: gross, modified gross, or net. The difference determines who pays for taxes, insurance, CAM, utilities, and repairs - and it can swing your true occupancy cost by 20–40%. This guide breaks down each structure with examples, shows which lease type dominates each asset class, and flags the specific line items to watch during LOI negotiation.

    The Three Families of Commercial Leases

    StructureBase RentTaxesInsuranceCAMUtilitiesRoof/Structure
    Full-Service GrossTLLLLL
    Industrial GrossTLLLTL
    Modified GrossTSplitSplitSplitTL
    Single Net (N)TTLLTL
    Double Net (NN)TTTLTL
    Triple Net (NNN)TTTTTL
    Absolute NNNTTTTTT

    T = Tenant pays, L = Landlord pays. Base rent is always the tenant.

    Which Structure Dominates Which Asset Class?

    • Retail - NNN is standard. Expect base rent + $6–$18 PSF in NNN charges.
    • Class A Office - Full-service gross with a base year is most common. All operating cost increases over year one pass through.
    • Class B/C Office - Modified gross is common; tenants often cover their own janitorial and utilities.
    • Medical Office - NNN or modified gross with tenant-paid janitorial and HVAC maintenance.
    • Industrial - Industrial gross or NNN. Larger warehouse deals almost always NNN.
    • Single-Tenant Net-Lease Investments - Absolute NNN or bondable NNN.

    How to Compare Total Occupancy Cost

    Never compare leases by base rent alone. Convert every offer to a 'total occupancy cost' number that includes base rent, estimated NNN or pass-throughs, and any tenant-paid utilities and maintenance.

    Example: Suite A quotes $28 PSF full-service gross with a base year. Suite B quotes $22 PSF NNN + $12 NNN = $34 PSF. Suite A is cheaper today, but if base year taxes reassess after a sale, occupancy cost can climb quickly. Always model year 1, year 5, and holdover year.

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