What Is a Letter of Intent for an Office Lease? (w/Examples) + FAQs

A Letter of Intent (LOI) for an office lease is a written summary of the main business terms two parties plan to put into a final lease, and most of it is non-binding on purpose. It lets a tenant and landlord agree on rent, size, term, and build-out before either side pays thousands of dollars in legal fees drafting a 90-page lease. The LOI keeps the deal moving while everyone checks the math, the market, and the fine print.

The problem the LOI solves is simple: commercial office leases are long, complex, and expensive to negotiate. Courts across the country apply rules from the Restatement (Second) of Contracts §27 to decide whether a preliminary writing is a real contract or just a plan, and a sloppy LOI can trigger a binding deal you never meant to sign. The landmark Texaco v. Pennzoil ruling cost Texaco more than \$10 billion because an “agreement in principle” was found enforceable, and that warning still shapes every office LOI written today.

According to a 2025 JLL occupier survey, roughly 68% of U.S. office leases over 5,000 square feet start with a signed LOI before lease drafting begins, and average negotiation time drops by 22 days when an LOI is used.

Here is what you will learn in this guide:

• 📝 How an office LOI works, what goes inside it, and which clauses are binding vs. non-binding
• ⚖️ The federal and state law that controls LOI enforceability, including the Pennzoil and SIGA rulings
• 💵 How to negotiate rent, tenant improvement (TI) allowances, free rent, and escalations inside the LOI
• 🏢 Three named real-world scenarios — a startup, a medical practice, and a law firm — showing LOIs in action
• 🚫 The seven most expensive mistakes tenants and landlords make when drafting or signing an LOI

What a Letter of Intent Actually Is in Commercial Real Estate

A Letter of Intent in commercial real estate is a short document, usually two to six pages, that captures the deal points the parties want to include in the final lease. It is sometimes called a term sheet, a memorandum of understanding, or a proposal letter, and brokers from groups like CCIM Institute and NAIOP treat it as the backbone of any office transaction. The document moves faster than a lease because it skips the legal boilerplate and focuses on rent, size, term, and use.

The LOI is also the first place where the tenant’s broker and the landlord’s broker test how serious each side really is. If the tenant refuses to commit to a term length or a rent number, the landlord learns early and can pivot to another prospect. The LOI protects both sides from wasting money on lease drafting when the deal is not yet real.

Why the LOI Matters More Than People Think

Most people treat the LOI as a formality, but courts treat it as evidence of intent. Under the Uniform Commercial Code §2-204 and the general common law of contracts, a writing that shows agreement on essential terms can form a contract even if the parties say they plan to sign something later. The plain-English meaning is that your words count, even in a “draft.”

The consequence of ignoring this rule is severe. A landlord who signs an LOI and then tries to accept a higher offer from another tenant can be sued for breach, and a tenant who walks away after signing can lose their deposit or face damages. The SIGA Technologies v. PharmAthene decision in Delaware awarded more than \$113 million because a term sheet created a duty to negotiate in good faith, showing how much a short document can cost.

A common misconception is that writing “non-binding” at the top of the LOI makes every line non-binding. It does not. Courts look at the whole document and the parties’ behavior, so a clear, well-drafted LOI is far safer than a vague one.

The LOI vs. the Lease vs. the Offer to Lease

An offer to lease is a one-sided proposal, usually from the tenant. An LOI is a two-sided summary signed by both parties. A lease is the full, binding contract that governs the relationship for years. Each document has its own job, and skipping one usually creates problems later.

The offer to lease is common in Canada but rare in the U.S. office market, where the LOI has largely replaced it. The LOI is faster and cheaper than the lease, which is why the BOMA International leasing guide recommends using one for any deal above 2,500 square feet. The lease itself then picks up every clause the LOI leaves out, from insurance to subordination to casualty.

The Legal Framework Behind an Office LOI

Federal law does not regulate office LOIs directly, but several doctrines from the Restatement (Second) of Contracts shape how courts read them. The most important is the rule that a preliminary agreement can be fully binding, partially binding, or not binding at all, depending on the parties’ intent. This three-tier framework comes from the Second Circuit’s Teachers Insurance & Annuity Ass’n v. Tribune Co. decision, which every real estate lawyer studies.

The consequence of this framework is that your words choose your risk. A letter that says “the parties agree to lease” reads very differently from one that says “the parties intend to negotiate toward a lease.” A real-world example is a Manhattan tenant who signed an LOI with the phrase “subject to mutual execution of a definitive lease,” and a New York court later held the landlord free to walk away because that language signaled no binding commitment yet.

A common misconception is that state law is uniform on this topic. It is not. New York, Delaware, and Texas enforce preliminary agreements more aggressively, while California courts often require clear essential terms before finding a binding deal.

Federal Baseline Rules

The Statute of Frauds, adopted in some form by every U.S. state, requires leases longer than one year to be in writing and signed. That means an oral promise to lease office space for three years is unenforceable, and even an LOI email exchange may qualify as a “writing” under the federal E-SIGN Act. Electronic signatures on LOIs are valid in every state.

The consequence of violating the Statute of Frauds is that the deal falls apart and neither side can force the other to perform. A practical example is a tenant who shakes hands on a five-year lease but never signs anything, and the landlord later rents to someone else — the tenant has no legal remedy. A misconception here is that a check or deposit creates a binding lease; it usually does not, unless the writing requirements are also met.

State-Level Variations

Each state tweaks the rules. New York follows the Tribune framework strictly, Delaware leans on good-faith negotiation duties under SIGA, Texas applies the Pennzoil “agreement in principle” doctrine, and California uses Civil Code §1624 to enforce writing requirements for long leases. Florida and Illinois sit in the middle, enforcing LOIs only when essential terms are clear.

The consequence of ignoring state nuances is that a clause that works in Dallas can bind you unintentionally in Wilmington. Before signing, ask your attorney which state’s law will control and whether a choice-of-law clause belongs in the LOI. Most sophisticated LOIs now include one.

The Core Components Every Office LOI Needs

A complete office LOI names the parties, the premises, the term, the rent, the escalations, the TI allowance, the free rent, the security deposit, the use clause, and the confidentiality and exclusivity terms. Missing any of these creates room for dispute later. The American Bar Association’s Model Commercial Lease materials list these as the non-negotiable building blocks.

Parties and Premises

The LOI must identify the tenant entity exactly as it will sign the lease, and the landlord entity by its legal name, not just the building nickname. The premises section lists the building address, floor, suite number, and rentable square footage, usually measured under BOMA 2017 standards. A misstated square footage of even 2% can cost a tenant tens of thousands of dollars over a 10-year term.

The consequence of naming the wrong entity is personal liability. If Jane Patel, founder of a startup, signs the LOI in her own name instead of her LLC’s name, she may be personally on the hook for the lease. The fix is to always sign as “Jane Patel, Manager, Patel Holdings LLC.”

Term, Rent, and Escalations

The term section states the lease length, the commencement date, and any renewal or expansion options. The rent section states the base rent per square foot per year, and escalations explain how rent grows — usually a fixed 3% annual bump or a CPI-based increase tied to the Bureau of Labor Statistics index. The 2026 national average for Class A office rent sits near \$52 per square foot per year, per CBRE’s 2026 Q1 MarketFlash.

A common misconception is that “gross rent” and “triple net (NNN) rent” mean the same thing. They do not. Under a gross lease, the landlord pays taxes, insurance, and common area maintenance (CAM); under an NNN lease, the tenant pays those charges on top of base rent, often adding \$10–\$20 per square foot.

Tenant Improvement (TI) Allowance and Free Rent

The TI allowance is money the landlord gives the tenant to build out the space, usually expressed as dollars per rentable square foot. In 2026, Class A TI allowances average \$85 per square foot for a 10-year term, according to the JLL office fit-out cost guide. Free rent, sometimes called rent abatement, typically runs one month per year of term.

Under IRC §110, a qualified construction allowance from a landlord to a retail tenant is excluded from the tenant’s taxable income, and office tenants often try to structure TI the same way. The consequence of mislabeling the allowance as “cash” instead of “construction allowance” can be a surprise tax bill.

Use, Exclusivity, and Assignment

The use clause defines what the tenant can do in the space — “general office use” is the most tenant-friendly. An exclusivity clause stops the landlord from leasing to direct competitors in the same building, and assignment rules govern whether the tenant can sublease. A narrow use clause locks the tenant into one business line, which hurts resale or sublease value.

How the LOI Process Works Step by Step

The LOI process starts with the tenant’s broker sending a request for proposal (RFP) to several landlords. Each landlord responds with a proposal, the tenant picks the best one, and the two sides exchange LOI drafts until both sign. The whole process takes 30 to 60 days for a typical deal.

Step 1: Tenant Broker Tours and RFP

The tenant and broker tour three to six buildings, then send a written RFP asking each landlord for rent, TI, free rent, and term. The RFP creates competition, and competition lowers rent. Tenants who skip this step often overpay by 8–15%, per Savills’ 2025 occupier report.

Step 2: Landlord Proposal

The landlord’s broker responds with a proposal, sometimes called a counter-LOI. The proposal lists the landlord’s asking rent, the TI it is willing to fund, the free rent, and any operating expense stops. The tenant’s team then scores each proposal on total effective rent, which is the net present value of all payments divided by the term and square footage.

Step 3: Negotiation and Signing

The parties exchange red-lined LOI drafts, usually three to six rounds, until both sign. Once signed, the landlord’s attorney drafts the lease, and the tenant’s attorney reviews it against the LOI. Any term not in the LOI is open to debate, which is why complete LOIs save money at the lease-drafting stage.

Step 4: Lease Drafting and Execution

Lease drafting takes 30 to 90 days. The final lease must match the LOI on every business term, and any change requires the other side’s consent. Once signed, the lease controls, and the LOI usually becomes irrelevant except to prove intent in a later dispute.

Three Real-World Scenarios

Different tenants face different LOI issues. The following scenarios show how the same document changes based on industry and goals.

Scenario 1: Startup Subleasing 2,000 Square Feet

Scenario 2: Medical Practice Signing a 10-Year NNN Lease

Scenario 3: Law Firm Taking a Full Floor in Midtown Manhattan

Concrete Named Examples

Example 1 — Jane Patel, founder of Patel Analytics LLC. Jane toured five buildings in Austin and signed an LOI for 3,200 square feet at \$42 per square foot with \$60 per square foot TI. Because she signed “Jane Patel, Manager, Patel Analytics LLC,” the LLC — not Jane personally — became the tenant, which protected her personal assets under Texas LLC law.

Example 2 — Dr. Marcus Chen, partner at Chen & Rivera Dental Group. Dr. Chen signed a 10-year NNN lease LOI in San Diego for 4,500 square feet. He insisted on a clause capping annual CAM increases at 4%, which saved his practice an estimated \$38,000 over the term once CAM inflation hit 7% in 2026.

Example 3 — Aisha Robinson, managing partner at Robinson Ellis LLP. Aisha’s law firm signed an LOI for a full floor in Chicago with a ROFO on the floor above and a termination right at year 7. When the firm grew faster than expected, the ROFO let her expand without paying a premium, and the termination right gave her flexibility the firm used as leverage in year 6.

Mistakes to Avoid

Seven costly LOI mistakes show up again and again in office deals, and each has a concrete negative outcome.

• Mistake 1: Leaving out the “non-binding” language. Without it, courts may enforce the LOI as a full contract, exposing you to damages.
• Mistake 2: Forgetting the exclusivity or good-faith negotiation clause. The landlord can shop your deal to a higher bidder and leave you out in the cold.
• Mistake 3: Agreeing to a narrow use clause. You lose the ability to sublease or pivot your business without landlord consent.
• Mistake 4: Missing the TI amortization detail. The landlord may add TI to base rent at a 9% interest rate, turning a “free” build-out into a hidden loan.
• Mistake 5: Signing as an individual instead of the entity. You create personal liability for the full lease term, which can be seven figures.
• Mistake 6: Ignoring the operating expense base year. A weak base year means every expense hike passes to you, sometimes adding \$5–\$8 per square foot annually.
• Mistake 7: Skipping the assignment and subletting section. You cannot transfer the space if your business sells, merges, or shrinks, which kills flexibility.

Do’s and Don’ts of Office LOIs

Following a short list of rules keeps the LOI working in your favor.

• Do label every non-binding section clearly, because courts read labels as evidence of intent.
• Do include a confidentiality clause, because market rent data is leverage you should protect.
• Do spell out the measurement standard (BOMA 2017), because square footage disputes cost real money.
• Do include a choice-of-law clause, because state law varies sharply on enforceability.
• Do keep the LOI to six pages or fewer, because length creates ambiguity.
• Don’t sign before your attorney reviews the binding sections, because one wrong word can bind you.
• Don’t rely on oral side deals, because the parol evidence rule usually blocks them.
• Don’t use a landlord’s form LOI without redlining, because it is written to favor the landlord.
• Don’t skip the expansion or renewal option, because re-negotiating from scratch later is always more expensive.
• Don’t forget to ask for a subordination, non-disturbance, and attornment agreement (SNDA), because a lender foreclosure can cancel your lease without one.

Pros and Cons of Using an LOI

Using an LOI has clear upsides and real downsides, and the best tenants weigh both.

• Pro: It locks in business terms before expensive lease drafting, saving legal fees.
• Pro: It creates moral and sometimes legal pressure on the landlord to honor the deal.
• Pro: It gives the tenant time to perform due diligence on the building and the landlord.
• Pro: It lets lenders and investors see the deal in writing before funding TI.
• Pro: It builds a paper trail that helps if the deal later goes to court.
• Con: It can accidentally bind you if drafted poorly, triggering Pennzoil-style damages.
• Con: It creates delay — 30 to 60 days — that fast-moving tenants cannot always afford.
• Con: It may reveal your walk-away number to the landlord if leaked.
• Con: It can create a false sense of security, leading tenants to skip due diligence.
• Con: It still needs a full lease behind it, so it does not eliminate legal fees, only delays them.

Key Court Rulings Every Tenant Should Know

Several court decisions shape how U.S. courts read office LOIs today. The Texaco v. Pennzoil opinion found that a handshake “agreement in principle” was enforceable and awarded more than \$10 billion in damages. The Teachers Insurance v. Tribune ruling created the three-tier preliminary-agreement framework New York still follows. The SIGA Technologies v. PharmAthene decision held that a term sheet created a duty to negotiate in good faith and led to \$113 million in damages.

The Brown v. Cara case from the Second Circuit confirmed that parties can be bound to negotiate in good faith even without a full contract. The Copeland v. Baskin Robbins case from California limited that duty when essential terms are missing. Each of these cases tells the same story: words matter, and your LOI is evidence.

Key Entities in an Office LOI Transaction

Several players and organizations shape every office LOI deal. The tenant signs the lease and operates the business. The landlord owns the building and collects rent. The tenant’s broker represents the tenant and is usually paid by the landlord. The landlord’s broker markets the space. The property manager operates the building day-to-day.

On the regulatory side, the Internal Revenue Service enforces §110 on TI tax treatment, the Bureau of Labor Statistics publishes the CPI data used in escalations, and BOMA International publishes the floor measurement standards most leases reference. Professional groups like CCIM Institute, NAIOP, and the American Bar Association’s Real Property section publish the guidance brokers and attorneys rely on.

Sample LOI Clauses in Plain English

A short, clear LOI is better than a long, vague one. The following plain-English examples show what strong clauses look like.

Premises: “The premises consist of Suite 1200 on the 12th floor of 100 Market Street, containing 8,420 rentable square feet as measured under BOMA 2017.”

Term: “The initial term is 84 months, commencing on the date the landlord delivers the premises in the condition required by the lease.”

Base Rent: “Base rent is \$48.00 per rentable square foot per year for year one, escalating 3.0% per year on each anniversary.”

TI Allowance: “Landlord will provide a tenant improvement allowance of \$85.00 per rentable square foot, paid against third-party invoices within 30 days of submission.”

Free Rent: “Tenant shall receive six months of free base rent, applied to months 1–6 of the term.”

Binding Sections: “Only the confidentiality, exclusivity, and expense-sharing sections of this LOI are binding. All other sections are non-binding and subject to a definitive lease.”

How the LOI Interacts With Due Diligence

Once the LOI is signed, the tenant has a short window to verify the building, the landlord, and the financials. Due diligence typically covers the building’s operating history, the landlord’s ownership and lender, the HVAC and elevator condition, the ADA compliance status, and the zoning under the local municipal code. Skipping this step is one of the costliest mistakes a tenant can make.

The consequence of weak due diligence is that problems discovered after lease signing become the tenant’s problem, not the landlord’s. An example is Aisha Robinson’s law firm, which during LOI due diligence discovered the building’s freight elevator was slated for a nine-month replacement, and Aisha used that knowledge to win an extra three months of free rent. Smart tenants use the LOI window to find leverage.

FAQs

Is an office LOI legally binding?

No. Most of the document is non-binding, but clauses like confidentiality, exclusivity, and good-faith negotiation usually are binding, so read every line carefully before signing.

Can a landlord back out after signing an LOI?

Yes. A landlord can usually walk away from the non-binding sections, but doing so after a clear good-faith clause can trigger damages under SIGA or Pennzoil principles.

Do I need a lawyer to draft an office LOI?

Yes. A real estate attorney costs \$1,500–\$5,000 for LOI review, and that fee is cheap compared to the six- or seven-figure risk of a poorly drafted clause.

Is an email chain an LOI?

Yes. Under the federal E-SIGN Act and state equivalents, an email exchange showing agreement on essential terms can qualify as a signed LOI, even without a PDF.

Does the Statute of Frauds apply to office LOIs?

Yes. Any lease longer than one year must be in writing, and courts apply the Statute of Frauds to LOIs that try to bind the parties to the lease itself.

Can I negotiate a TI allowance in the LOI?

Yes. The LOI is exactly where you negotiate TI dollars per square foot, disbursement timing, and whether unused TI becomes rent credit or is forfeited.

Is free rent the same as a rent abatement?

Yes. Both terms mean the tenant pays no base rent for a set number of months, though “abatement” sometimes also covers operating expenses during the free period.

Should I sign an LOI as an individual?

No. Always sign as an officer of your LLC, corporation, or partnership to protect personal assets; signing in your own name creates personal liability for the full lease term.

Does the LOI replace the lease?

No. The LOI summarizes business terms, but the lease is the binding, long-form contract that controls the relationship and supersedes the LOI once signed.

Can I include a termination right in the LOI?

Yes. Early termination rights, kick-out clauses, and contraction options all belong in the LOI, because adding them later in lease drafting is far harder to negotiate.

Is the LOI confidential?

Yes. Most office LOIs include a confidentiality clause that is binding, because rent, TI, and free rent data are competitive leverage both sides want to protect.

Can I assign my LOI to another company?

No. LOIs are almost never assignable, and any assignment right must be negotiated into the lease itself, usually with landlord consent not unreasonably withheld.