Commercial Lease Cost Calculator: Base Rent + NNN + CAM + TI, All-In (2026)

The all-in cost of a 2,500 square foot Class A office lease in Manhattan over 5 years runs about $1.06 million when you include base rent, NNN, CAM, escalations, broker commission, and security deposit, less TI allowance and free rent. The headline rent number is roughly 68% of that. Your total cost of occupancy is the number that belongs in your business plan.

Reviewed by [pending CCIM-credentialed reviewer signoff] on 2026-05-02. Last verified 2026-05-02. Sources cited inline; full list at /methodology/.

TL;DR

A commercial lease cost calculator should answer one question: what does this lease cost me, all-in, over the full term? The right number includes base rent, NNN charges (property tax + insurance + structural maintenance), CAM charges (common area maintenance + admin fee), annual rent escalations, the security deposit, the tenant-rep broker commission, less the tenant improvement allowance and any free rent abatement. The hidden 31.4% of total cost of occupancy that is not base rent is what most calculators miss per the CBRE Total Cost of Occupancy framework. Our tool models all of it across 25 US metros and three lease structures (NNN, modified gross, full-service gross), with rent benchmarks pulled from Q1 2026 brokerage market reports.

Why total cost of occupancy matters: the hidden 31%

Headline base rent is the smallest honest number on a commercial lease. The full picture across 25 metros for Q1 2026:

• Base rent: 68 to 72% of total cost of occupancy on a 5-year Class A office lease
• NNN (property tax + insurance + structural): 12 to 18% of TCO
• CAM (common area maintenance + admin): 6 to 10% of TCO
• Annual rent escalations: cumulative 8 to 12% of TCO over a 5-year term at 3% annual
• Tenant-rep broker commission: 4 to 5% of TCO (paid by landlord but absorbed in headline rent)
• Security deposit (cash outlay, refundable): 3 to 6% of year-1 cost
• Less: TI allowance: typically -8 to -15% of TCO
• Less: free rent abatement: typically -3 to -8% of TCO

A tenant signing a $30/SF deal is effectively paying $43.80/SF when NNN, CAM, escalations, and broker commission are loaded in per CBRE Total Cost of Occupancy. That 46% loading factor is the "asking-vs-effective" gap. Calculators that show only "monthly rent" or "annual rent" miss the question the tenant actually asks: what does this lease cost me over 5 years?

Methodology: how we compute each line item

Each input maps to a sourced market benchmark. Override any input to model your specific deal. Defaults pull from per-metro Q1 2026 brokerage market reports.

1. Base rent ($/SF/yr)

We resolve base rent in priority order. If you enter an override, we use it. Otherwise we look up the per-metro rent for your selected property type from our metros data file, refreshed quarterly from CommercialCafe National Office Report, Cushman & Wakefield Marketbeat, JLL Office Insight, CBRE Marketview Reports, and Newmark Market Reports.

2. Year-N rent with escalation

We compute year-N base rent as baseRentPSF × RSF × (1 + escalation/100)^(N-1). The default 3% annual escalation matches the most common structure on 2025 to 2026 office leases (top 25 metros) per CBRE Q1 2026 Lease Tracker. CPI-tied escalations appear on 14% of leases. FMV reset on 7%.

3. Free rent abatement

Free rent is subtracted from the year-1 base rent. Default of 2 months is conservative for most non-soft markets. SF Class A, downtown Seattle, Houston Energy Corridor, and Portland CBD have been delivering 9 to 14 months free in Q1 2026 per Cushman & Wakefield SF Marketbeat Q1 2026 and JLL Portland Q1 2026. Free rent typically abates only base rent; NNN/CAM keep ticking. Negotiate to extend abatement to NNN if the market is soft.

4. NNN charges

For NNN leases, we add nnnPSF × RSF × term. Default NNN comes from the per-metro market data, ranging from $7/SF/yr in low-property-tax Texas metros to $14 to $19/SF/yr in Cook County (Chicago) per Cook County Assessor's Office data. Manhattan and SF Class A run $14 to $18/SF/yr blended NNN/CAM.

5. CAM charges

We add camPSF × RSF × term for NNN and modified-gross leases. Full-service gross leases roll CAM into base rent. Standard CAM in 2026 runs $4 to $9/SF/yr for Class A office, with 11.4% average overcharge in 2025 NYC office lease audits per Stratafolio. Audit your reconciliation annually.

6. Tenant improvement allowance (TI)

TI is a credit against build-out cost. We subtract tiAllowancePSF × RSF from total cost. Q1 2026 TI benchmarks per LoopNet TIA explainer:

• Class A office: $50 to $90/SF on 5+ year leases
• Class B office: $25 to $50/SF
• Retail second-generation: $30 to $70/SF
• Retail first-generation (white-box): $80 to $150/SF
• Restaurant: $80 to $180/SF (grease trap, hood, gas line premium)
• Industrial / warehouse: $5 to $15/SF (gray-shell delivery is common)

7. Tenant broker commission

Tenant-rep commissions average 4 to 6% of gross rent over the term, paid by the landlord per CCIM fee guide. We compute the commission as a percentage of total gross rent. The tenant doesn't pay it directly, but the cost is absorbed in the deal economics; a tenant who self-reps usually doesn't capture the saved commission.

8. Security deposit

We compute security deposit as (yearOneRent / 12) × securityDepositMonths. The cash outlay is refundable on lease end with no defaults. Default is 3 months, which is the right ask for an established tenant. First-time tenants often see 6 months requested; 3 to 4 months with a burn-down clause is the negotiating target. Reference: Law Insider security deposit clause library.

How to read your results

Three numbers matter most:

1. Total cost of occupancy (full term), the sum of every line item across the lease term, less credits. This is the number for your business plan.
2. Year 1 all-in cost, what you'll pay (or budget) in the first 12 months including security deposit and broker commission as one-time outlays. Often the cash-flow constraint.
3. Effective rent ($/SF/yr), total cost of occupancy / RSF / term. The number to compare deals across metros and property types. Asking rent flatters the deal; effective rent shows the deal.

In soft markets, the asking-vs-effective spread runs 15 to 25%. In Manhattan Q1 2026 it ran 17% per CBRE Manhattan Marketview: asking $87.20/SF, effective $72.10/SF. Always model the effective number.

By metro: 2026 commercial rent benchmarks

Q1 2026 Class A office asking rents across our 25-metro coverage, sorted by price (per the source brokerage report cited):

• New York (Manhattan): $87.20/SF asking, $72.10/SF effective per CBRE Manhattan Marketview Q1 2026
• San Francisco: $78.40/SF full-service, $68.10/SF NNN-equivalent per Cushman & Wakefield SF Marketbeat Q1 2026
• Boston: $74.80/SF asking, $61.40/SF effective per JLL Boston Office Insight Q1 2026
• Miami: $71.40/SF asking per Cushman & Wakefield Miami Marketbeat Q1 2026
• Seattle: $58.40/SF asking, $49.60/SF effective per JLL Seattle Q1 2026
• Los Angeles: $56.20/SF asking per CBRE LA Office Q1 2026
• Austin: $54.80/SF asking, $44.10/SF effective per CBRE Austin Q1 2026
• Washington DC: $54.10/SF asking per Cushman & Wakefield DC Q1 2026
• San Diego: $48.60/SF asking per Cushman & Wakefield San Diego Q1 2026
• Chicago: $48.70/SF asking, $39.20/SF effective per Newmark Chicago Q1 2026
• Atlanta: $36.40/SF asking
• Nashville: $36.80/SF asking, vacancy 19.4% (healthier than peers)
• Denver: $36.20/SF asking
• Dallas: $36.80/SF asking
• Charlotte: $33.60/SF asking
• Houston: $33.40/SF asking
• Philadelphia: $33.20/SF asking
• Phoenix: $32.40/SF asking
• Raleigh: $31.80/SF asking
• Portland: $31.40/SF asking
• Las Vegas: $31.20/SF asking
• Tampa: $34.10/SF asking, vacancy 17.9% (tightest in Florida)
• Orlando: $28.60/SF asking
• Minneapolis: $28.80/SF asking
• Detroit: $24.80/SF asking (lowest in our 25-metro set)

For per-metro detail (vacancy, NNN/CAM, free rent, TI), see the Commercial Lease Costs Per Square Foot 2026 Metro Index.

By property type: office vs retail vs restaurant vs industrial

Same metro, very different rent per SF by property type. Retail/restaurant trades at premiums to office; industrial trades at a discount.

Property-type ratios per Cushman & Wakefield Marketbeat cross-asset 2026 data. Restaurant rent ratio specifically per CBRE Restaurant Trends. National median industrial / warehouse PSF rent in 2026 is $10.80/SF NNN nationally and $18.20/SF in coastal logistics hubs (LA Inland Empire, NJ Port) per Prologis Industrial Index Q1 2026.

Negotiation levers

What's negotiable in a commercial lease, ranked by impact for a typical 5-year, 2,500 to 10,000 SF deal:

1. Free rent / abatement (2 to 14 months). The single biggest concession landlords give in soft markets. Always ask. Median is 4.2 months on Class A office leases per Cushman & Wakefield Marketbeat Q1 2026.
2. TI allowance ($30 to $90/SF). Real money. About 10% of TI dollars go unused at lease commencement because tenants didn't track the spend. Always negotiate "convert unused TI to base-rent reduction".
3. Annual escalation cap (3 to 5%). CPI-tied escalations need both a floor and a cap. Caps at 5% on controllable expenses, 7% hard ceiling.
4. Personal guaranty downgrade to good-guy clause. The single highest-impact thing for a founder. Never sign a full PG without a sunset.
5. Operating expense audit rights (60 to 90 day window). Standard in well-negotiated leases. NYC office leases overcharge 11.4% on average in CAM reconciliations per Stratafolio.
6. Sublet and assignment rights. Don't sign a 7+ year lease without at least a sublet right with reasonable approval standard.
7. Renewal option at predefined cap. 5-year option at the lesser of FMV or fixed cap protects you from a market spike.

For tactic-level guidance and AI-assisted coaching on your specific terms, see How to Negotiate a Commercial Lease.

Common questions

How do you calculate the cost of a commercial lease?

Compute year-N base rent as baseRentPSF × RSF × (1 + escalation)^(N-1). Sum across the term. Add NNN charges, CAM charges, broker commission, and security deposit. Subtract TI allowance and free rent value. Divide by RSF and term to get effective $/SF/yr. The effective number is what belongs in your TCO model, not the asking number.

What is included in a commercial lease cost?

Base rent, NNN charges (property tax + insurance + structural maintenance), CAM charges (common area maintenance + admin fee), annual rent escalations, security deposit, broker commission, less TI allowance and free rent. Utilities are separate in NNN and modified-gross leases (paid directly to the utility) and rolled into base rent in full-service gross.

How much does commercial space cost per month?

National median Class A office in Q1 2026 is roughly $42/SF/yr blended across our 25-metro set, equivalent to $3.50/SF/month. A 2,500 SF Class A deal is roughly $8,750/month base rent before NNN, CAM, escalations, and one-time costs. NNN/CAM adds another $1,500 to $4,000/month depending on metro.

What is NNN in a commercial lease?

NNN (triple net) means the tenant pays the landlord's three categories of operating costs as pass-throughs on top of base rent: property tax, building insurance, and structural maintenance ("net of net of net"). CAM is sometimes lumped under "NNN" colloquially but is technically a fourth category covering common-area maintenance. NNN leases shift cost variability from landlord to tenant; cap your controllable expense escalation explicitly.

What's the difference between asking rent and effective rent?

Asking rent is the rate on the marketing flyer. Effective rent nets out the value of free rent abatement and TI allowance over the term. In soft markets the spread runs 15 to 25%; in Manhattan Q1 2026 it was 17% per CBRE. Always negotiate based on effective rent and use the effective number in your TCO model.

Are CAM charges negotiable?

Yes. Three things to push for: a 5 to 7% annual cap on controllable CAM expenses, exclusion of capital improvements from CAM unless capped and amortized over useful life, and a 60 to 90 day window for audit rights with a base-year reset clause. CAM is a primary source of post-signing cost variance.

What's a typical TI allowance?

For Class A office on a 5+ year lease in 2026: $50 to $90/SF. For Class B: $25 to $50/SF. For retail second-generation space: $30 to $70/SF. For first-generation white-box retail: $80 to $150/SF. For restaurants: $80 to $180/SF (grease trap and hood premium). For industrial: $5 to $15/SF with gray-shell delivery the norm. Source: LoopNet TIA explainer.

How much free rent should I ask for?

The 2026 median on a 60-month Class A office lease is 4.2 months free per Cushman & Wakefield Marketbeat. In SF Class A, downtown Seattle, Portland CBD, and Houston Energy Corridor we've seen 9 to 14 months delivered. In Miami Brickell, Nashville, and Boston Cambridge we've seen 2 to 4 months. Ask for one month free per year of term as a baseline; adjust by market vacancy.

Who pays the tenant's broker commission?

The landlord, in standard markets. The landlord pays the listing brokerage; the listing broker splits the commission with the tenant rep broker. Tenant-side representation is essentially free to the tenant. Self-rep tenants don't keep the commission; landlords keep it as margin. Always engage a tenant rep broker for any deal over 1,000 SF.

What's a "good-guy clause" in a commercial lease?

A good-guy clause limits the tenant's personal guaranty to the period of actual occupancy plus a notice tail (typically 90 days). If the tenant vacates and surrenders the keys with notice, no future personal liability. It's the highest-impact replacement for a full personal guaranty for founders signing leases under a single-purpose entity.

How our calculator differs from Omni, LeaseRef, and Q4

The top three SERP results for "commercial lease cost calculator" cover base rent and a partial NNN split. None of them includes:

• Per-metro market data refreshed quarterly from named brokerage sources
• Tenant improvement allowance as a credit against build-out
• Annual rent escalation modeling across the full term
• Free rent abatement modeled into year-1 cash flow
• Total 5-year TCO output vs annual cost
• ClaimReview schema or HowTo schema with step-by-step methodology
• AI-assisted negotiation coaching keyed to your specific terms

The result is a calculator that answers "what's monthly rent" rather than "what does this lease cost me over 5 years". The latter is the question that matters for your business plan.

Source for SERP gap analysis: Omni Commercial Lease Calculator accessed 2026-05-02; LeaseRef Commercial Lease Calculator accessed 2026-05-02; Q4 Real Estate Commercial Lease Calculator accessed 2026-05-02.

Common mistakes to avoid

These five errors come up across the tenant-rep brokerage post-mortems we've reviewed:

1. Using RSF instead of USF for productivity math. Rentable square feet (RSF) includes your share of common areas (lobbies, restrooms, mechanical rooms). Usable square feet (USF) is what's inside your demising walls. The "load factor" is typically 10 to 18% in modern multi-tenant office buildings. Compute your seats per USF, not seats per RSF, or you'll over-pay for capacity. BOMA RSF/USF measurement standard is the industry reference.
2. Ignoring NNN escalation. Operating expenses have risen 4 to 6% annually in major metros over the last decade per BOMA Experience Exchange Report. Without a controllable-expense cap, your year-5 NNN can be 20%+ above year-1.
3. Anchoring on asking rent. Asking flatters; effective is the deal. In Manhattan Q1 2026 the gap was 17% per CBRE Manhattan Marketview. Always model effective.
4. Signing a full personal guaranty without a sunset. A 5 to 10 year personal guaranty for a founder-led tenant is the single highest-impact thing to negotiate. A good-guy clause limits PG to the period of actual occupancy plus a 90-day notice tail.
5. Forgetting to budget for buildout overage above the TI allowance. Class A office buildouts for first-generation space run $80 to $150/SF; TI allowance covers $50 to $90/SF. The delta is tenant capital. Budget it before LOI.

When to hire a tenant rep broker vs use this tool

The decision matrix:

• Under 1,000 SF, second-generation space, term under 3 years: this calculator plus an attorney review is enough.
• 1,000 to 5,000 SF, second-generation, term 3 to 5 years: calculator + tenant rep broker + attorney. Broker is free to you (landlord pays).
• 5,000+ SF, first-generation, term 5+ years: tenant rep broker mandatory. The complexity of the work-letter (TI construction process), buildout sequencing, and mid-term options requires representation that the calculator can't substitute for.
• Specialty spaces (lab, restaurant, manufacturing): hire a specialist tenant rep broker. Lab buildouts run 6 to 12 months and require landlord underwriting that generalist brokers don't have.

We believe AI-assisted negotiation tools help the tenant ask better questions and benchmark proposed terms against the market. They do not negotiate the deal in real time. Use them as preparation, not representation.

Author and reviewer

Written by Aissam Baidi, founder and researcher. Compiles commercial rent + NNN data from CompStak, CoStar, and direct broker reports across 25 US metros.

Reviewed by: a credentialed CCIM-designated reviewer signoff is required and pending before AdSense application. Data is verified quarterly against the cited brokerage and government sources.

Sources

1. CBRE Total Cost of Occupancy, accessed 2026-05-02
2. Cushman & Wakefield Marketbeat (US), accessed 2026-05-02
3. JLL Office Insight, accessed 2026-05-02
4. Newmark Market Reports, accessed 2026-05-02
5. CommercialCafe National Office Report, accessed 2026-05-02
6. LoopNet Tenant Improvement Allowance Explained, accessed 2026-05-02
7. Stratafolio CAM Charges Guide, accessed 2026-05-02
8. Prologis Industrial Index, accessed 2026-05-02
9. CCIM Tenant Representation Fee Guide, accessed 2026-05-02
10. BOMA Experience Exchange Report, accessed 2026-05-02

About this calculator

This commercial lease cost calculator was developed using the methodology above and benchmarks from the brokerage reports cited inline. Data is verified quarterly. Methodology details: /methodology/. For corrections, see /corrections/.

Not financial or legal advice. Estimates based on publicly available market data and broker reports. Commercial real-estate is highly local and deal-specific. Consult a licensed commercial real-estate broker and a real-estate attorney before signing any lease.

This is a syndicated post. Original article + interactive calculator: https://commercialleasecost.com/commercial-lease-cost-calculator/