Net effective rent is the average annual or monthly rent a landlord collects over a lease term after subtracting the value of concessions such as free rent and tenant improvement allowances. It converts a lease with front-loaded discounts and scheduled increases into a single comparable rate, so that two leases with very different structures can be measured against each other. The calculation takes total rent due over the term, subtracts total concessions, and divides by the term length and the leased area.
Why Net Effective Rent Exists
Face rent, the headline number in a lease, is a poor measure of what a deal is actually worth. A landlord can quote a high base rent and then give it back through months of free rent, a large improvement allowance, and generous renewal terms. Two spaces quoted at the same rate per square foot can produce very different economics once concessions are included.
Net effective rent strips away that noise. By spreading every concession across the term, it answers a single question: on average, what is the landlord really collecting per square foot per year? That number is what belongs in a rent comparable set, an underwriting model, or a broker's side-by-side of competing options.
There are two common vantage points. The landlord's net effective rent nets out the concessions the landlord grants. A tenant's effective rent looks at the same numbers from the paying side and answers what the space actually costs per year on average. The arithmetic is nearly identical; the framing differs.
The Core Formula
The simplest version of the calculation is:
Net effective rent = (Total base rent over term - Total concessions) / Term length / Rentable area
Every input needs to be defined consistently. Total base rent over term is the sum of every month's contractual rent, accounting for escalations. Total concessions is the dollar value of free rent plus any tenant improvement allowance and other landlord contributions. Term length is expressed in years or months, and rentable area is the rentable square feet the rent is charged on.
The one decision that changes the result is whether to discount future cash flows to present value. A simple, or undiscounted, net effective rent treats a dollar in year five the same as a dollar in year one. A discounted net effective rent applies a discount rate so that later rent is worth less today, which is more accurate but requires choosing a rate. Both are used in practice. The worked example below computes the simple version and then shows the effect of discounting.
Step by Step
The calculation follows a fixed sequence. Doing the steps in order prevents the most common mistake, which is netting concessions against the wrong base.
Build the rent schedule. List base rent for every year of the term, applying the escalation clause. This is the gross rent the tenant would pay with no concessions.
Value the free rent. Multiply the number of abated months by the rent that would have applied during those months. Free rent is almost always taken at the start of the term, so it is usually valued at year-one rent.
Add other concessions. Include the tenant improvement allowance and any moving allowance, lease assumption, or cash contribution the landlord funds.
Sum total concessions and subtract from total rent. This gives net rent collected over the full term.
Divide. Divide net rent by the term length to get annual net effective rent, then by rentable area to get the per-square-foot figure.
Worked Example
Consider a hypothetical five-year lease on 10,000 rentable square feet. The numbers below are illustrative.
Starting base rent: 40.00 per square foot per year
Annual escalation: 3 percent
Free rent: 6 months, taken at the start
Tenant improvement allowance: 50.00 per square foot
First, build the gross rent schedule.
Year | Rent per SF | Annual rent (10,000 SF) |
1 | 40.00 | 400,000 |
2 | 41.20 | 412,000 |
3 | 42.44 | 424,360 |
4 | 43.71 | 437,091 |
5 | 45.02 | 450,204 |
Total | 2,123,655 |
Next, value the concessions.
Concession | Calculation | Value |
Free rent (6 months at year-1 rate) | 400,000 / 12 x 6 | 200,000 |
TI allowance | 50.00 x 10,000 | 500,000 |
Total concessions | 700,000 |
Now net and divide.
Step | Amount |
Total gross rent over term | 2,123,655 |
Less total concessions | (700,000) |
Net rent collected | 1,423,655 |
Divide by 5 years | 284,731 per year |
Divide by 10,000 SF | 28.47 per SF per year |
The face rent started at 40.00 per square foot, but the net effective rent is 28.47 per square foot, roughly 29 percent below the headline. That gap is the true cost of the concession package, and it is invisible if you only look at the quoted rate.
Discounting to Present Value
The simple calculation above treats year-five rent as worth the same as year-one rent. Because money has a time value, a more precise net effective rent discounts each year's rent to present value before averaging. Using an 8 percent discount rate on the same schedule, the later years shrink in today's terms, and the free rent, taken up front, loses very little value. The discounted net effective rent in this example would land a few dollars per square foot below the simple figure, because the escalated back-end rent is discounted more heavily than the front-loaded concessions.
The choice of method should be consistent across any comparable set. Comparing a discounted figure for one lease against a simple figure for another produces a meaningless ranking. Whichever convention is chosen, apply it to every lease in the comparison.
Common Mistakes
A few errors recur often enough to be worth naming.
Valuing free rent at the wrong rate. Free rent taken later in the term is worth more per month because rent has escalated. Value abated months at the rate actually in effect during those months, not always year one.
Ignoring recoveries. On a triple net lease, the tenant also pays operating expenses. Net effective rent normally covers base rent, but a full cost-of-occupancy comparison should note the recovery structure so a net lease is not compared head-to-head with a gross lease.
Mismatching area. Rent is charged on rentable area, which includes a share of common space via the load factor. Make sure both the rent and the divisor use rentable, not usable, square feet.
Forgetting a concession. Moving allowances, lease-assumption payments, and extra abatement for early access all reduce effective rent and are easy to miss when they sit outside the base rent schedule.
Because these inputs are scattered across the rent schedule, the concessions section, and the work letter, a reliable net effective rent depends on a clean lease abstraction that captures every concession field.
Frequently Asked Questions
What is the difference between face rent and net effective rent? Face rent is the quoted contractual rate before concessions. Net effective rent is the average rate the landlord actually collects after subtracting free rent, improvement allowances, and other contributions. Face rent overstates the economics whenever a deal includes concessions.
Does net effective rent include operating expenses? Usually no. Net effective rent typically covers base rent net of concessions. Operating expense recoveries are handled separately, though a complete occupancy-cost comparison should account for whether each lease is gross or net so the structures are comparable.
Should net effective rent be discounted to present value? Both simple and discounted versions are used. Discounting is more accurate because it reflects the time value of money, but it requires choosing a discount rate. The most important rule is to use the same method across every lease being compared.
How is free rent valued in the calculation? Free rent is valued by multiplying the number of abated months by the rent that would have applied during those months. Since abatement is usually taken at the start of the term, it is typically valued at year-one rent, though later abatement is worth more per month.
Conclusion
Net effective rent turns a lease full of front-loaded discounts and back-loaded escalations into one comparable number: the average rent a landlord collects, or a tenant pays, per square foot per year. The method is straightforward. Build the full rent schedule, value every concession, net them out, and divide by term and area. The discipline is in capturing every concession and applying one consistent method, discounted or simple, across the whole comparison set. Done correctly, it exposes the real economics that a quoted face rate hides.