How to Use This Tool
Reconcile allowance, landlord work and tenant build-out instead of quoting only dollars per square foot. Calculate tenant improvement allowance, tenant funding gap and monthly lease-equivalent support from editable deal assumptions.
The decision this tool supports
A headline allowance per square foot does not show whether the tenant's actual scope is funded or how landlord work is classified. This page keeps the decision bounded to allowance amount and the supporting outputs shown beside it. Tenant Improvement does not import an account, infer a market rate, or silently substitute an industry average.
Inputs and units
The Tenant Improvement calculation uses Rentable area, Allowance, Landlord work outside allowance, Tenant build-out budget, Lease term. Keep all money values in one currency and all time, distance, mass, energy or volume entries in the unit printed beside the field. Mixing Tenant Improvement scopes can produce a plausible number with the wrong meaning.
- Rentable area is entered in ft².
- Allowance is entered in currency/ft².
- Landlord work outside allowance is entered in currency.
- Tenant build-out budget is entered in currency.
- Lease term is entered in months.
Formula and worked check
Allowance amount = rentable area × allowance per square foot. Tenant gap = budget − allowance − separate landlord work, floored at zero. $40 per ft² across 2,000 ft² creates an $80,000 allowance; with $15,000 separate landlord work and a $110,000 budget, the tenant gap is $15,000. The Tenant Improvement default is an executable known-answer case, not a benchmark or recommendation. Change one input and verify that the direction of allowance amount still matches the stated relationship.
How to interpret the result
The funding gap is a negotiation and budgeting input; the monthly figure only spreads allowance across the entered term and is not GAAP rent accounting. The additional Tenant Improvement outputs expose the denominator, comparison, capacity or reverse value needed to audit the primary result instead of presenting one unexplained number.
Assumptions
- Area and allowance basis match the lease definition.
- Landlord work is genuinely outside the allowance.
- The lease term is entered in whole planning months.
Save the Tenant Improvement input values and date with any material decision. A later Tenant Improvement rerun is reproducible only when the same assumptions and units are available.
Limitations and safety boundary
The page does not interpret a lease, amortize interest, calculate tax treatment, construction escalation, change orders or local permitting. Tenant Improvement is an estimate and cannot replace a contract, local code, licensed professional, calibrated measurement, lender statement or platform report where one governs the decision.
Source and privacy
The Tenant Improvement definition or rule was checked against U.S. General Services Administration — Leasing resources on 2026-08-26. Recheck U.S. General Services Administration — Leasing resources when a specification or policy behind Tenant Improvement can change. Tenant Improvement arithmetic runs in this browser tab; ecech does not receive the values through a calculation API.
Sources & assumptions
Tool Spec v2 · verified 2026-08-26. Platform rules and fees can change; the editable inputs remain authoritative for your account.
Official references
- U.S. General Services Administration — Leasing resources (checked 2026-08-26)
Model assumptions
- Area and allowance basis match the lease definition.
- Landlord work is genuinely outside the allowance.
- The lease term is entered in whole planning months.
- The page does not interpret a lease, amortize interest, calculate tax treatment, construction escalation, change orders or local permitting.
