Landlords and brokers speak in acronyms and legalese that can feel designed to keep you guessing.
This glossary breaks down the terms you'll encounter most as you launch, lease, or grow a coworking space — so you can walk in knowing what you're agreeing to.
We've grouped them into categories. Bookmark it, share it with your team, and come back to it every time a new term shows up in a lease you don't recognize.
The type of lease you sign determines what costs you're responsible for. Understanding these upfront will save you from surprises down the road.
Triple net lease (NNN)
A lease where the tenant pays base rent plus three additional expenses: property taxes, building insurance, and maintenance costs. NNN leases are common in commercial real estate and can add significant dollars per square foot on top of your base rent.
Gross lease / full-service lease
The landlord covers most or all operating expenses — utilities, taxes, maintenance — and you pay one flat rent. More predictable for budgeting, though landlords typically price in a buffer for those costs.
Modified gross lease
A hybrid between NNN and gross. You and the landlord split the operating expenses, usually spelled out in detail in the lease. Read the fine print carefully — 'modified' means different things to different landlords.
Percentage rent
A clause where you pay base rent plus a percentage of gross revenue once you exceed a certain threshold (the 'breakpoint'). More common in retail, but some landlords include it for coworking operators. Worth negotiating out if you can.
The number on the listing is rarely the full picture. Here's what makes up what you'll actually pay.
Base rent
The fixed monthly or annual amount you pay before any additional charges. Usually quoted as a per-square-foot annual rate (e.g., $30/sf/year), then divided by 12 for monthly payments.
CAM charges (common area maintenance)
Fees you pay toward the upkeep of shared spaces — lobbies, hallways, parking lots, elevators. In a NNN lease, CAM charges can fluctuate year to year, so ask for historical CAM numbers and a cap before signing.
Rent abatement / free rent
A period at the start of your lease where you pay little or no rent — a concession the landlord offers to get you in the space. Often used to offset the cost of build-out. Always negotiate for it; it's one of the most common landlord incentives.
OpEx (operating expenses)
All the costs to run a building: utilities, insurance, taxes, maintenance, management fees. In a NNN lease, you share these. In a gross lease, the landlord absorbs them. Either way, know what's included.
Concessions
Perks a landlord offers to close a deal — free rent, TI allowance, parking spaces, reduced security deposit. Concessions are negotiable, especially in a tenant-friendly market or when a space has been sitting vacant.
Not all square footage is equal. Understanding how space is measured affects your layout, your pricing, and what you're paying for.
Rentable square footage (RSF)
The total square footage you're billed for, which includes your actual usable space plus a proportionate share of common areas like lobbies and hallways. This is what you see in listings and what rent is calculated on.
Usable square footage (USF)
The space your business actually occupies — no shared hallways, stairwells, or lobby included. This is what you can physically use for desks, offices, and common areas.
Load factor (loss factor / R/U ratio)
The multiplier that converts usable to rentable square footage. A load factor of 1.15 means 15% of your rent goes toward shared spaces. Lower is better for tenants. Typical range is 1.10–1.20, but can be higher in older buildings.
Class A, B, and C space
A rough quality classification for office buildings. Class A is the newest or most recently renovated, with premium amenities and finishes, usually in prime locations. Class B is functional but older or less polished. Class C is typically older, lower-cost space in less desirable areas. Coworking spaces can thrive in any class — it depends on your target member.
CBD (central business district)
The commercial core of a city — downtown, the financial district, wherever the density of office workers is highest. CBD space typically commands the highest rents but also attracts the most drop-in traffic.
Getting a raw space ready for coworking requires construction. Here's the vocabulary around who pays for what.
Build-out
The construction work required to transform a raw or previously occupied space into your finished coworking environment — walls, flooring, lighting, electrical, data infrastructure, and everything else. Build-outs can run anywhere from $30 to $150+ per square foot depending on quality and market.
Tenant improvement allowance (TI allowance)
Money the landlord agrees to contribute toward your build-out costs. Usually expressed as a per-square-foot amount (e.g., $50/sf TI). You manage the construction; the landlord reimburses you up to the cap. Always push for more — this is one of the most negotiable parts of any commercial lease.
Turnkey build-out
The landlord handles and pays for the entire build-out, handing you a finished space ready to occupy. Less flexibility to customize, but no construction headaches or out-of-pocket costs.
Shell space (cold dark shell)
A completely unfinished space with no interior walls, HVAC, plumbing, or electrical beyond the building's main systems. Starting from shell gives you full design control but requires the most build-out investment.
Certificate of occupancy (CO)
The official document from your local government confirming that a space has been inspected and is legally approved for its intended use. You can't open to members without it. Factor permitting and CO timelines into your opening schedule.
Commercial leases are long, complex documents. These are the terms that will come up in negotiations and in the fine print.
Letter of intent (LOI)
A non-binding document that outlines the key terms of a proposed lease before a full agreement is drafted. Think of it as the handshake before the contract. Landlords take LOIs seriously, and it's smart to get the major deal points agreed here before lawyers get involved.
Lease abstract
A concise summary of the most important terms in a lease — rent, term length, renewal options, TI, key dates. If you're ever reviewing a lease you inherited or a sublease, getting a clean abstract done first will save hours of back-and-forth.
Lease term
The length of the lease agreement, usually expressed in years. Coworking operators often sign 5–10 year leases to justify build-out costs, then offer members month-to-month or annual memberships — that gap between your commitment and your members' commitment is the core risk of the coworking model.
Renewal option
A clause giving you the right (not the obligation) to extend the lease for an additional term at a pre-agreed rent or at market rate. Always try to include multiple renewal options with rent caps — it protects your ability to stay once you've built a community in the space.
Personal guarantee
When you sign personally as well as through your LLC or corporation, putting your personal assets on the hook if the business defaults. Landlords often require it from newer operators. Negotiate to limit it to 1–2 years of rent rather than the full lease term.
Estoppel certificate
A document signed by a tenant confirming the current status of their lease — rent amount, no outstanding disputes, lease start and end dates. Landlords often request these when selling the building. You may be asked to sign one; read it carefully before you do.
Assignment and subletting
Assignment means transferring your lease entirely to another party. Subletting means you lease part (or all) of your space to a third party while remaining on the hook to the landlord. Many coworking leases restrict both — know your rights before you need to use them.
Holdover
What happens when your lease expires and you keep paying rent without a new agreement in place. Most leases convert to a month-to-month holdover at a higher rate (often 150% of your last rent) to incentivize you to renew or vacate. Don't let your lease lapse without a plan.
If you're talking to investors, brokers, or landlords who see their buildings as assets, these terms will come up.
Cap rate (capitalization rate)
A quick measure of a property's return: NOI divided by property value. A lower cap rate means a more expensive or lower-yielding property. As a tenant, you don't calculate it, but understanding it helps you understand why a landlord behaves the way they do.
NOI (net operating income)
A property's gross income minus operating expenses, before debt service. It's what landlords care about — your rent is part of their NOI. Understanding NOI helps you understand what motivates a landlord to negotiate.
Vacancy rate
The percentage of available space in a building or market that isn't leased. High vacancy means more negotiating power for you as a tenant. Low vacancy means landlords hold the cards.
Absorption
The rate at which available commercial space gets leased in a given market over a period of time. Positive absorption means more space is being leased than vacated. It's a signal of how competitive the market is for tenants.
Flex space
A catch-all term for office space that offers flexible lease terms, configurations, or use types — including coworking, short-term office suites, and hybrid industrial-office buildings. The term is sometimes used interchangeably with coworking, but flex space is the broader category.
This is by no means an exhaustive list of every term you'll encounter in commercial real estate, but it covers the vocabulary you're most likely to hit in your first few years as a coworking operator. When in doubt, ask questions — a good commercial broker or real estate attorney can be worth every penny on a lease that will define your business for the next decade.