Effective rent translates a lease’s headline rent into comparable economics. For an owner, a useful first calculation subtracts free rent, landlord-funded tenant improvements, and leasing commissions from scheduled rent, then divides by the relevant area and lease term. A stronger investment comparison discounts the actual cash flows because spending at commencement and receiving rent years later are not economically equivalent.
State the definition every time. Tenant effective rent, landlord net effective rent, and accounting rental revenue answer different questions. A number that includes only rent abatements cannot fairly be compared with one that also deducts buildout and commissions.
Choose the comparison boundary
Decide whether the analysis begins at lease execution, delivery, or rent commencement. Decide whether the period includes vacant downtime before occupancy. A five-year lease beginning after nine months of vacancy should not be compared with an immediate renewal as if both start today.
Use consistent area measures. A rent quoted per rentable square foot cannot be compared directly with one quoted per usable square foot. Preserve measurement assumptions in the lease abstract. Also keep gross, modified-gross, and net expense responsibilities consistent; a lower rent may leave more operating costs with the owner.
CCIM’s financial-analysis curriculum treats time value, financing costs, and investment performance measures as related analytical disciplines. The calculations below are original illustrations, not reproductions of its course materials. CCIM financial analysis.
Hypothetical comparison: higher asking rent, lower proceeds
Consider two five-year proposals for a 5,000-square-foot office suite. Both have flat rent for simplicity and equivalent operating-expense allocation. Neither contains renewal options in this comparison.
| Item | Proposal A | Proposal B |
|---|---|---|
| Annual face rent per square foot | $32 | $29 |
| Scheduled five-year rent | $800,000 | $725,000 |
| Free base rent | Six months: $80,000 | Two months: $24,166.67 |
| Landlord TI | $60/sf: $300,000 | $25/sf: $125,000 |
| Commission, assumed 5% of scheduled rent | $40,000 | $36,250 |
| Undiscounted rent less listed costs | $380,000 | $539,583.33 |
| Net effective annual rent per square foot | $15.20 | $21.58 |
Proposal A’s face rent is $3 per square foot higher. Yet Proposal B produces approximately $159,583 more over the same five-year period before operating expenses, downtime, financing, taxes, and residual value. That conclusion follows from the assumptions; actual commissions must follow the signed brokerage arrangement rather than the illustrative 5% convention.
The formula is (scheduled rent − free rent − landlord TI − commissions) ÷ leased area ÷ years. It is a screening metric, not NOI, cash-on-cash return, or a valuation.
Build monthly cash flow before discounting
The annual average hides the investment’s hardest period. Proposal A requires $340,000 of TI and commission while six months of base rent are abated. If the property cannot fund that period, a positive average effective rent does not solve the liquidity problem.
Create one column per month. Put actual TI payments in the months required by construction or reimbursement milestones. Put commissions at contractual payment dates. Include free-rent months, rent escalations, operating recoveries, vacant carry, and any rent-start contingencies. Separate costs paid directly by the landlord from tenant allowances reimbursed after documentation.
For a simple discounting demonstration, suppose $100,000 is paid today and $25,000 is received at each year-end for five years. At an illustrative 8% annual discount rate, the present value of the five receipts is approximately $99,818; net present value is approximately negative $182. An undiscounted $25,000 profit therefore does not imply an attractive return at an 8% hurdle. The discount rate is a chosen scenario, not a current market benchmark.
When using monthly periods, use a consistent periodic rate. If 8% is an effective annual rate, the monthly rate is (1.08)^(1/12) − 1, not automatically 8% divided by twelve. State the convention so another analyst can reproduce the model.
Make the concession schedule explicit
Free rent can mean free base rent only, or it can include other charges. A tenant may still pay expense recoveries, parking, storage, or utilities during abatement. Read the actual concession paragraph rather than entering zero revenue for every category.
An allowance may reimburse defined hard costs, include architectural fees, expire if unused, or require the tenant to fund overruns. It may also be conditioned on opening or delivering lien waivers. Separate the maximum contractual allowance from expected cash expenditure; use the appropriate assumption for each scenario.
TI owned or funded by the landlord may have some residual usefulness after the tenant leaves. Do not assume all spending is permanently lost, but do not assign full residual value to specialized partitions or equipment without replacement-tenant evidence. Model residual value as a separate assumption rather than silently reducing the concession.
Compare renewal with replacement fairly
A current tenant’s renewal may have lower face rent but require less buildout, lower commissions, and no vacancy. A new tenant can appear superior if the model starts only when its first full rent payment arrives.
Assume a renewal produces $140,000 annually for five years with $40,000 of owner leasing costs: $660,000 before operating expenses. A replacement produces $160,000 annually for five years but requires $240,000 of leasing costs and nine months of vacant carry at $4,000 monthly. Its corresponding total is $524,000 before lost-rent timing and other differences. The periods are not yet identical: the replacement’s five-year lease ends nine months later. Compare both alternatives over a common hold period and include a consistent residual value.
Use renewal probability only as an additional scenario. A weighted expected cost can help compare deals, but the property needs enough liquidity for the full nonrenewal case. A 30% chance of a $300,000 replacement does not mean $90,000 will fund the actual replacement.
Chicago comparisons require lease-level evidence
Compare actual competing spaces with similar buildout, condition, access, term, and delivery. A Loop full-service office quote, a suburban medical suite, and a neighborhood storefront cannot be normalized by face rent alone. Do not apply a public metropolitan average to a small building without supporting alternatives.
For a proposed change of use, verify zoning and the relevant approval path before treating a quoted allowance as sufficient. The City’s zoning resource can start that review; property-specific conclusions require the actual parcel and use. Chicago zoning reference.
Get contractor and brokerage input on the exact scope. The useful question is the price of delivering this suite to this tenant, including utility, HVAC, access, and finish requirements. A generic per-square-foot assumption should remain visibly provisional until it is supported.
Separate leasing economics from reported earnings
Accounting may recognize rent on a different timing basis than cash collection. For underwriting, retain distinct rows for contractual cash rent, noncash accounting adjustments, tenant allowances, and commissions. A period of strong reported rent can still require significant cash funding.
Public office-owner reporting provides a useful original-source example of why leasing costs, property capital, revenue, and non-GAAP operating measures should be reviewed separately. Do not treat the company’s definitions or portfolio figures as universal underwriting standards. BXP 2025 filing.
A lender may underwrite a different cash flow or require reserves. Send the term sheet, lease assumptions, and leasing-cost schedule together when discussing proceeds. Financing based on stabilized rent does not necessarily fund the months required to reach it.
Use a decision sheet rather than one impressive rent figure
For each proposal, show face rent, concession-adjusted rent, net landlord effective rent, present value, initial cash required, maximum cumulative cash deficit, tenant credit, break rights, and residual building condition. These measures reveal different dimensions of the decision.
A lower effective rent may be acceptable for a stronger obligor, a shorter delivery schedule, or a lease that improves financeability. A higher effective rent may justify more capital when evidence supports the tenant and market. Document the reason instead of obscuring it in the headline rate.
Before signing, reconcile the final lease against the approved model. A changed commencement date, allowance, renewal option, or expense clause can alter the investment after the economic terms appeared settled. Keep the final assumptions with the executed documents so future owners can reconstruct the original decision.
Check a rent escalation without hiding the concession
Suppose a five-year lease begins at $100,000 annually and increases 3% at each anniversary. Scheduled annual rent is $100,000, $103,000, $106,090, $109,272.70, and $112,550.88, totaling $530,913.58. If the first three months of year-one base rent are abated, subtract $25,000 before deducting landlord leasing costs. Do not apply three months of the fifth-year rent or an average annual rent unless the actual agreement says so.
For 4,000 square feet, a $100,000 allowance and $25,000 commission reduce the illustrated undiscounted landlord proceeds to $380,913.58. Dividing by 4,000 square feet and five years produces about $19.05 per square foot annually. The first-year face rate is $25 per square foot; neither number should be mislabeled as the other.
Now check partial months, different anniversary conventions, and abatements that apply after a rent increase. Round only for presentation and retain full calculation precision. If the concession can be recaptured following a default, do not treat recapture as certain base-case income; its collection depends on the document, circumstances, and counterparty. A small schedule error repeated across many leases can become a material underwriting discrepancy.
A filed lease separately states base-rent abatement and continuing direct-expense obligations during that period. It supplies a concrete document example of why an abated base-rent cell should not automatically zero every receipt. Filed abatement provision.