Net Effective Rent Explained: How to Calculate It on an Office Lease

Net effective rent is the average rent a landlord actually earns over the full lease term after concessions, mainly the tenant improvement allowance and free rent, are subtracted from the face rent. It is the number office REITs, asset managers, and lenders underwrite to, because two leases with the same headline rate can collect very different real income once concessions are factored in. This guide walks through how net effective rent works, how to calculate it, and why it sits at the center of office lease analysis.

What is net effective rent?

Net effective rent is the total rent a tenant pays over the term, minus the landlord's concession costs, spread evenly across every month or year of the lease. Face rent, sometimes called the asking or contract rate, is the per-square-foot number on the first page. Net effective rent adjusts that number for the deal the landlord actually signed: months of free rent, a tenant improvement allowance funded up front, moving allowances, and any abatement. On a competitive office deal, the gap between face rent and net effective rent can be ten to twenty percent or more, which is why a rent roll built on face rates overstates real income.

How do you calculate net effective rent?

The simplest method: add up all the base rent the tenant pays across the term, subtract the landlord's concession costs (free rent and TI allowance), then divide by the number of periods in the term. Take a 5-year office lease at $50 per square foot with 3.0 percent annual escalations, 6 months of free rent, and a $40 per square foot TI allowance. Total contract rent over 5 years is roughly $265 per square foot. Subtract about $25 per square foot of free rent and the $40 TI allowance, leaving roughly $200, then divide by 5 years to get a net effective rent near $40 per square foot, well below the $50 face rate. The exact figure depends on whether you discount future cash flows to present value, which institutional owners usually do.

Net effective rent vs face rent vs gross rent

Face rent is the quoted base rate before any concessions. Gross rent (or full-service rent) is the rate that bundles operating expenses and taxes into one number, as opposed to a net rate where the tenant pays those separately. Net effective rent is different from both: it is not about what is bundled in, it is about what the landlord nets after paying for concessions over time. A lease can be quoted gross or net and still have a face rate far above its net effective rent once free rent and TI are counted.

Why does net effective rent matter to office REITs and lenders?

Net effective rent is the rent that drives value. An office REIT pricing an acquisition or reporting to investors needs the real rent curve across hundreds of leases, not the headline rates, and a lender sizing a loan underwrites to the income the building actually collects. That is why the concession terms have to be abstracted lease by lease before any model is trusted. Our full breakdown of that workflow is in lease abstraction for office REITs, and the loan-sizing angle is covered in lease abstraction for lenders.

What is included in the concession package?

The concession package is everything the landlord gives up to win the deal. The two big items are free rent (abated months, often early in the term) and the tenant improvement allowance (dollars per square foot the landlord funds to build out the space). Smaller concessions include moving allowances, a temporary space credit, and sometimes a one-time cash inducement. Each one lowers net effective rent, so each one has to be pulled out of the lease and the work letter accurately. When a tenant later signs the lease and the work letter, owners usually execute them with an online document e-signing tool so the concession terms and commencement date are locked the same day.

How do escalations affect net effective rent?

Escalations push net effective rent the other way, upward, by raising base rent each year of the term. A lease with steep annual bumps collects more total rent than a flat lease at the same starting rate, so its net effective rent is higher even with the same concessions. That is why you cannot judge a deal on the starting rate alone: a low face rate with strong escalations and light concessions can beat a high face rate loaded with free rent and TI. Abstracting the full escalation schedule, not just year one, is what makes the comparison real.

How does abstraction make net effective rent reliable?

Net effective rent is only as accurate as the inputs, and those inputs sit in different parts of a long lease and its amendments: the rent schedule, the abatement clause, the work letter, and any side letters. Lease abstraction pulls all of them into one consistent record per lease, with each value linked back to the clause it came from, so an analyst can verify a TI allowance or a free-rent period in seconds instead of re-reading the document. Across a portfolio, that consistency is what lets a REIT compare deals and report on real income. The fields a complete abstract should carry are listed in our commercial lease abstract template, and the high-volume path is bulk lease abstraction. Once rent is collected, finance teams typically reconcile the monthly payments and concession credits against the lease in QuickBooks to keep the books tied to the abstract.

The bottom line

Net effective rent strips the marketing out of a lease and shows what the landlord really earns. For office owners, REITs, and lenders, it is the only rent number worth underwriting to, and getting it right depends on abstracting every concession and escalation accurately, lease by lease. Start with one lease in the tool above to see the rent schedule, TI, and free-rent terms pulled automatically, then read how a portfolio comes together in lease abstraction for office REITs.