Commercial rent is usually quoted as an annual price per square foot. To get monthly base rent, multiply the rate by the space’s rentable square feet and divide by 12, then add any NNN or pass-through charges. That is the core math behind every office, retail, medical, and industrial lease in Austin; the rest of this guide covers the details that change the total.
How to read a $/SF rent quote
A listing that says “$30/SF NNN” means $30 per square foot per year in base rent, with taxes, insurance, and common area costs billed separately. A listing that says “$30/SF full service” means those costs are included. The label after the number tells you which lease type you are looking at, and it matters as much as the number itself.
Annual to monthly: a worked example
For a hypothetical 3,000 SF space at $30/SF NNN, with hypothetical NNN charges of $10/SF:
| Item | Annual | Monthly |
|---|---|---|
| Base rent (3,000 SF x $30) | $90,000 | $7,500 |
| NNN charges (3,000 SF x $10) | $30,000 | $2,500 |
| Total occupancy cost | $120,000 | $10,000 |
All figures here are hypothetical and chosen to make the math easy to follow. Real rates and NNN charges vary widely by building. The formula is the same either way:
- Annual base rent = rate x rentable SF
- Monthly base rent = annual base rent / 12
- Add pass-throughs, then suite utilities, janitorial (if not included), and any other charges
Our lease cost calculator runs this for you, including escalations over the term.
Rentable vs usable square feet
Office and some medical buildings charge rent on rentable square feet (RSF), not the usable square feet (USF) you actually occupy. Rentable square footage adds your share of common areas such as lobbies, corridors, shared restrooms, and mechanical rooms.
The load factor is the percentage added. For a hypothetical suite with 2,500 usable SF and a hypothetical 20% load factor:
- Rentable SF = 2,500 x 1.20 = 3,000 RSF
- At a hypothetical $30/SF, rent is based on 3,000 SF ($90,000 per year), not 2,500 SF
When comparing two office suites, compare both the rate and the load factor. A lower rate in a building with a higher load factor can cost more for the same usable space. Retail and industrial space is often measured with little or no load factor, but confirm how the landlord measured it. If you are unsure how much space you need, try our office space calculator.
Rent escalations
Most leases raise rent each year through a rent escalation clause. The two common forms:
- Fixed percentage: rent increases by a set percentage each year. Predictable and easy to model.
- CPI-based: rent increases with an inflation index such as the Consumer Price Index, sometimes with a floor and ceiling. Less predictable, and a ceiling (cap) protects you in high-inflation years.
Some leases use fixed dollar bumps instead (for example, an added amount per SF each year) or step increases every few years.
Escalation example over a five-year term
For the same hypothetical 3,000 SF space at $30/SF with a hypothetical 3% fixed annual escalation:
| Lease year | Rate ($/SF/yr) | Annual base rent | Monthly base rent |
|---|---|---|---|
| 1 | $30.00 | $90,000 | $7,500 |
| 2 | $30.90 | $92,700 | $7,725 |
| 3 | $31.83 | $95,481 | $7,957 |
| 4 | $32.78 | $98,345 | $8,195 |
| 5 | $33.77 | $101,296 | $8,441 |
| Total | $477,822 |
Because increases compound, the total base rent over five years is more than five times the first year’s rent. Always budget from the full schedule, not just year one.
NNN and other add-ons
On a NNN lease, the monthly bill includes estimated taxes, insurance, and common area maintenance. Those estimates are adjusted each year, so your total can move even if base rent is fixed. We cover what is in those charges, how CAM reconciliation works, and how to cap them in NNN and CAM charges explained.
Other common add-ons include suite electricity and water, janitorial, after-hours HVAC in office buildings, reserved parking, signage fees, and percentage rent in some retail centers.
Free rent and TI allowance
Landlords compete with concessions, not just rate.
- Free rent is a period at the start of the lease (or spread across it) when base rent is waived. NNN charges may still be due, so check whether the free period is “gross” or “base rent only.”
- Tenant improvement (TI) allowance is money the landlord contributes to build out your space, quoted per SF. A hypothetical $40/SF allowance on 3,000 SF is $120,000 toward construction. Costs above the allowance are typically yours.
Longer terms and stronger tenant credit generally support larger concessions. How the allowance is paid out matters too; see commercial lease terms that matter.
Net effective rent: comparing offers fairly
Net effective rent is the average rent you actually pay over the term after concessions. Here is a simplified, hypothetical comparison for a 3,000 SF space on a five-year (60-month) term with flat rent and no escalations, to keep the math clear:
| Offer A | Offer B | |
|---|---|---|
| Quoted rate | $30.00/SF | $29.00/SF |
| Free rent | 3 months | 6 months |
| Total base rent before free rent | $450,000 | $435,000 |
| Value of free rent | $22,500 | $43,500 |
| Total base rent paid | $427,500 | $391,500 |
| Net effective rent | $28.50/SF | $26.10/SF |
Net effective rent = total base rent paid / years / SF. For Offer A: $427,500 / 5 / 3,000 = $28.50.
Offer B looks only slightly cheaper on paper, but costs meaningfully less once free rent is counted. A fuller analysis also accounts for escalations, TI differences, and the time value of money, but this simple version catches most of the difference between offers.
Security deposits
A security deposit protects the landlord if the tenant defaults. The amount depends on the tenant’s financial strength, the length of the lease, and how much the landlord is investing in the space. Many deposits equal one or more months of rent; a newer business, or one asking for a large TI allowance, may be asked for more, a letter of credit, or a personal guarantee. Negotiate when the deposit is returned and whether it can step down after a period of on-time payments.
Get help running the numbers
A tenant rep agent models total cost across every option and negotiates the rate, escalations, and concessions together. Tristen Palori, a licensed commercial real estate agent, represents Austin tenants, and the fee is typically paid by the landlord. See tenant representation or contact us with the spaces you are comparing. Owners can see landlord representation.
FAQ
Frequently asked questions
How is commercial rent calculated?
Most commercial rent is quoted as dollars per square foot per year. Multiply the rate by the rentable square feet for annual rent, then divide by 12 for the monthly payment. Add NNN or other pass-through charges if the lease is not full service.
Is commercial rent quoted monthly or annually?
In Austin and most of the U.S., commercial rent is quoted as an annual rate per square foot. A few small spaces are quoted as a flat monthly amount, so confirm which one a listing uses.
What is a load factor in commercial real estate?
The load factor is the percentage added to your usable square footage to cover your share of common areas like lobbies, corridors, and restrooms. Rent is charged on the resulting rentable square footage.
What is net effective rent?
Net effective rent is the average rent you actually pay over the lease term after subtracting concessions like free rent. It is the fairest way to compare offers with different rates and concessions.
How much is a security deposit on a commercial lease?
It varies with the tenant's financial strength and the landlord's investment in the space. Many deposits equal one or more months of rent; newer businesses may be asked for more or for a letter of credit.
What is a typical annual rent increase on a commercial lease?
Most leases include a fixed annual escalation or one tied to inflation. The rate is negotiable and varies by property type and market conditions, so compare total rent over the term rather than just the starting rate.