Follow the default numbers.
With leased area of 2,500 sq ft, the model gives first-year monthly occupancy cost: $6,750.
The formula is base rent + taxes/insurance + pro-rata cam. Open the breakdown to trace expenses and assumptions. Change one input at a time to see how your decision changes. This example uses scenario inputs; it is not an offer, tax bill, appraisal or legal determination.
Annual unit rent becomes monthly occupancy cost
Base rent per square foot per year times leased area gives annual base rent. Taxes and insurance are entered as a separate annual unit allowance. CAM is allocated by leased area divided by the building’s allocable area. The result adds all three and divides by twelve for a monthly comparison. Confirm the lease’s actual area denominator and expense definitions.
CAM budgets are not final reconciliation
Actual common-area charges can differ from budget, include exclusions or use a negotiated allocation instead of simple area. Administrative fees, caps, gross-ups, capital costs and audit rights can materially change the bill. Do not enter CAM again in the taxes-and-insurance allowance. The calculator shows your pro-rata share and its annual cost explicitly.
The projection escalates base rent only
Annual escalation applies to base rent in the schedule. Taxes, insurance and CAM remain constant as stated assumptions. A gross-lease comparison also remains constant unless you enter another scenario. Some leases use monthly rent per square foot rather than annual, so check the units before copying a quote. This estimate does not interpret an executed commercial lease.
Keep your assumptions with the result
Save the calculation to your deal file to reuse compatible inputs in another tool. The file stays in this browser on this device. Download the CSV to open the complete inputs, results and schedule in Excel or Google Sheets. Use PDF to print the report or save it as a PDF. A share link includes entered financial figures in its URL, so use it only with people you intend to share those numbers with.