A comprehensive calculator for total commercial lease occupancy cost. Enter your base rent, lease type charges, and square footage to see your true annual and monthly cost.
By Angel Campa, Founder · Updated March 2026
Total Annual Cost = (Base Rent + Operating Expenses + CAM) × Square Footage
For gross leases, operating expenses are included in base rent — set NNN charges to zero. For NNN/modified gross leases, add each pass-through separately.
| Leased Square Footage | 3,500 sq ft |
| Base Rent | $24.00/sq ft/year |
| NNN / Operating Expense Pass-Throughs | $8.50/sq ft/year |
| Monthly Parking / Other Charges | $0 |
Result
$113,750/year ($9,479/month)
| Line Item | Value |
|---|---|
| Base Rent | $84,000/year |
| NNN / Operating Expenses | $29,750/year |
| Parking / Other | $0/year |
| Total Annual Cost | $113,750/year |
| Monthly Payment | $9,479/month |
| All-In Rate | $32.50/sq ft/year |
Property taxes + insurance + CAM. Enter 0 for gross leases.
Optional: parking, storage, antenna fees, etc.
Result
$112,000/year ($9,333.33/month)
| Line Item | Value |
|---|---|
| Base Rent | $84,000 |
| NNN / Operating Expenses | $28,000 |
| Parking / Other | $0 |
| Total Annual Cost | $112,000 |
| Monthly Payment | $9,333.33 |
| All-In Rate | $32.00/sq ft/year |
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It varies significantly by market, building class, and lease type. Class A office in major markets runs $35–$80+/sq ft/year all-in. Retail strip center space typically runs $18–$35/sq ft base rent with $6–$12/sq ft NNN charges. Industrial/warehouse space ranges from $8–$20/sq ft all-in depending on the market.
In a NNN lease, your rent is split: you pay base rent plus separate operating expense pass-throughs (taxes, insurance, CAM). In a gross lease, all operating expenses are bundled into a single rent figure. NNN leases tend to have lower base rents but total occupancy cost is often similar. Use this calculator with NNN set to zero for gross lease comparisons.
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