Houston Commercial Lease and Property Terms: A Plain-English Glossary

Every Term You Will Meet in a Houston Lease — Defined, With the Local Wrinkle

Commercial real estate runs on vocabulary that nobody explains to you before handing you a forty-page lease. Here is every term you are likely to meet in a Houston deal, defined plainly, with the local wrinkle noted where Texas or Harris County does it differently.

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How to Use This Glossary

This glossary is the companion to our guide to reading a Houston commercial lease, which covers how these terms interact and which ones to negotiate. Use this page when you hit a word in a document and need to know what it means and whether it should worry you. It is part of the broader commercial real estate resource library, which is added to weekly.

One framing note before the definitions. Commercial lease vocabulary is not neutral. Much of it exists to describe who bears which cost, and the terms that sound most technical—load factor, base year, controllable CAM—are usually the ones with the most money attached. If a term appears in your lease and you cannot immediately say which party it benefits, that is the term to ask about.

Rent Structures

Base Rent	The quoted rent for the space itself, before any operating expenses, taxes, insurance or common area charges are added. In a NNN deal this is roughly two-thirds of what you will actually pay.
Gross Lease	One rent number covering everything — base rent plus taxes, insurance, maintenance and usually utilities. Predictable for the tenant, and priced accordingly.
Modified Gross	A split. The landlord typically covers property taxes and building insurance; the tenant covers utilities, janitorial and sometimes a share of increases. Common in Houston office and medical.
Triple Net (NNN)	Base rent only. The tenant pays a proportionate share of property taxes, building insurance and common area maintenance on top. Standard for retail and industrial, increasingly common in office space.
Absolute Net	NNN taken further — the tenant also carries roof, structure and capital repairs. Common in single-tenant net-lease investment property.
Percentage Rent	Additional rent calculated as a percentage of the tenant's gross sales above an agreed breakpoint. Almost exclusively retail, common in Kingwood Town Center-style centers.
Escalation Clause	The mechanism that raises rent over the term. Fixed 2–3% annually is predictable; CPI-indexed should carry both a floor and a ceiling.
Free Rent / Rent Abatement	A period of reduced or zero rent, usually at the start of a term, offered as a concession. Confirm whether it abates base rent only or the net charges too.

Space and Measurement

Usable Square Feet (USF)	The space actually inside your demised premises. What you occupy.
Rentable Square Feet (RSF)	Usable square feet plus your proportionate share of building common areas. What you pay on.
Load Factor	The percentage that converts USF to RSF. Houston office commonly runs 10–18%. Two buildings quoting an identical rate can bill very differently.
BOMA Standard	The measurement methodology used to calculate rentable area. Ask which version applies — the standards have been revised and they do not produce identical numbers.
Demised Premises	The legal description of exactly what you are leasing. Read it against the floor plan; discrepancies happen.
Shell Condition	Unfinished space — typically concrete floor, exposed ceiling, capped utilities. Everything else is build-out.
Second Generation Space	Previously built-out space being re-leased. Often cheaper to occupy because much of the improvement already exists.
Pad Site	A separately developable parcel, usually at the front of a retail center, typically for a freestanding building such as a restaurant or bank.

Operating Costs and CAM

CAM (Common Area Maintenance)	The tenant's share of maintaining shared areas — landscaping, parking, lighting, security, management fees. The line item most worth auditing — see commercial property management for the landlord's side.
Controllable CAM	CAM the landlord can influence, as distinct from taxes and insurance. This is the portion a cap should apply to, typically 3–5% annually.
CAM Reconciliation	The annual true-up between estimated CAM you paid monthly and actual expenses incurred. Ask for the prior two years before signing.
Base Year	The first lease year, whose actual operating expenses set your baseline. You pay increases above it. A base year set during low occupancy or before a post-sale tax reassessment is a trap.
Expense Stop	An alternative to a base year — a fixed dollar amount per square foot the landlord covers, above which the tenant pays. More predictable.
Pro Rata Share	Your percentage of the building, used to allocate shared costs. Confirm how it is calculated and whether it is based on leased or total area — the difference matters in a partly vacant building.
Audit Right	Your contractual right to inspect the landlord's expense records. Frequently omitted from a first draft and frequently granted when requested.
Operating Expenses (OpEx)	The full cost of running the property. What counts as OpEx versus capital expenditure is negotiable and consequential.

Deal Terms and Tenant Protections

Tenant Improvement Allowance (TI)	The landlord's contribution to building out your space, quoted per rentable square foot. Negotiate who controls the work, who owns the improvements, and what happens to unused allowance.
Restoration Clause	An obligation to return the space to its original condition at lease end. Can be a five-figure exit cost. Negotiate it at signing, when you have leverage.
Personal Guaranty	A promise to cover the lease obligation from personal assets if the business cannot. Avoid full-term guaranties where possible.
Good-Guy Clause	A limited guaranty covering only the period you actually occupy the space, provided you give proper notice and surrender it in good condition. Commonly granted when asked for.
Assignment and Subletting	Your right to transfer the lease or sublet the space. Insist consent be 'not unreasonably withheld' or selling your business later becomes the landlord's decision.
Estoppel Certificate	A signed statement confirming lease terms and that neither party is in default. Lenders and buyers require them; you will be asked to sign one during a sale or refinance.
SNDA	Subordination, Non-Disturbance and Attornment. Protects your leasehold if the landlord's lender forecloses. Worth having.
Holdover	Occupying after the term expires. Holdover rent is typically 150–200% of the last rate. Do not drift into it accidentally.

Investment, Diligence and Texas-Specific Terms

Cap Rate	Net operating income divided by purchase price. The market's shorthand for yield and risk on an income property.
NOI (Net Operating Income)	Gross income less operating expenses, before debt service and capital expenditure. The numerator in the cap rate.
Debt Service Coverage Ratio	NOI divided by annual debt service. Lenders generally want 1.20–1.35 or better.
1031 Exchange	A like-kind exchange deferring capital gains tax when sale proceeds are reinvested in qualifying property within statutory deadlines. Strict timelines — 45 days to identify, 180 to close.
Phase I ESA	An environmental site assessment reviewing a property's history for contamination risk. Standard on fuel, industrial and dry-cleaning sites — see the gas station buyer guide.
Phase II ESA	Follow-up testing with soil borings and groundwater sampling, triggered when a Phase I identifies a recognized environmental condition.
MUD District	A Municipal Utility District — a local entity providing water, sewer and drainage, funded by a separate tax. Widespread across the Houston suburbs and a real line item.
Deed Restrictions	Private recorded covenants governing use, setbacks and appearance. In a city without zoning, these are the primary land-use control — and they are enforceable.

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Reading a Houston Commercial Lease →

How these terms interact and which clauses to negotiate before signing.

Commercial Real Estate Resources →

The full library — guides, checklists and submarket profiles.

Houston Commercial Real Estate →

Office, retail, industrial and investment property across the metro.

Office Space in Kingwood & Houston →

Available office space and typical terms by submarket.

Medical Office Space →

The additional terms that apply to medical build-outs.

Retail Space for Lease →

Strip centers, endcaps and pad sites in the corridor.

Commercial Property Management →

CAM reconciliation and the landlord side of these terms.

Gas Stations & C-Stores for Sale →

Where Phase I, Phase II and underground storage tanks come into play.

Frequently Asked Questions

What is the difference between usable and rentable square feet?

Usable square feet is the area inside your leased premises. Rentable square feet adds your proportionate share of building common areas — lobbies, corridors, restrooms, mechanical rooms. You occupy usable and you pay on rentable. The conversion is the load factor, commonly 10 to 18% in Houston office buildings.

Is NNN better or worse than a gross lease for a tenant?

Neither, inherently. A gross lease is predictable and the landlord prices that predictability into the rate. A NNN lease is cheaper on the quoted number and shifts expense risk to you. What matters is whether you have visibility into the net charges and protection against them escalating — a CAM cap, an exclusions list and an audit right.

What is a reasonable CAM cap in Houston?

Three to five percent annually on controllable expenses, ideally cumulative so an underspent year carries forward. Taxes and insurance are normally excluded from the cap since the landlord cannot control them. Many first-draft leases contain no cap at all, and many landlords will add one when asked.

What is a MUD district and will it cost me money?

A Municipal Utility District is a local government entity that provides water, sewer and drainage in areas outside full city service, funded by its own property tax on top of county and school taxes. They are common throughout the Houston suburbs including much of the Lake Houston corridor. The rate varies significantly by district and should be verified for the specific parcel.

Do deed restrictions really matter if Houston has no zoning?

Yes, very much. Deed restrictions are private covenants recorded against the land and they are enforceable by other owners in the same subdivision. They can control use, building type, signage, setbacks and hours of operation. In practice they do much of the work zoning does elsewhere, and they are discovered through title review rather than a map.

What is a good-guy clause and can I get one?

It is a limited personal guaranty covering only the time you actually occupy the space, provided you give the agreed notice and leave it in good condition — as opposed to guaranteeing the full remaining term. Landlords grant them regularly, particularly to tenants with a reasonable operating history. It is one of the highest-value asks in a small-business lease negotiation.

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