What Is a Letter of Intent (LOI) and How Binding Is It?

What an LOI actually does in a lease deal

The LOI is the deal blueprint, and it is the single highest-leverage document in the entire transaction—not a throwaway formality. Whatever you win here, the full lease almost always honors; whatever you skip here, you fight uphill to add later, usually against a signed-lease deadline and mounting legal fees. Landlords and their attorneys understand this, which is why a landlord's standard LOI is written to favor the landlord and why sending it back unchanged is the most expensive mistake a tenant can make.

A tenant-favorable LOI captures three distinct buckets of terms. First come the economic terms: base rent stated in dollars per square foot, annual escalations (commonly 2%–3%), the lease term (frequently 5 or 10 years), renewal or extension options, the tenant-improvement (TI) allowance (often ranging from roughly $30 to $80+ per square foot depending on market and space condition), and a free-rent or buildout period (commonly 60–120 days of abated rent while you construct). Second come the space terms: rentable versus usable square footage, the load factor that separates the two, delivery condition (cold shell, warm shell, or turnkey), and parking ratios expressed as stalls per 1,000 square feet. Third come the key clauses you must flag now: co-tenancy, exclusive-use, relocation rights (which you generally want deleted), HVAC repair-and-replacement responsibility, assignment and sublease rights, and any kick-out or early-termination right tied to sales thresholds or headcount changes.

The discipline is simple: if a clause matters to you, name it in the LOI. Silence at this stage is precisely how a landlord's attorney wins the lease draft later. A term that is never raised in the LOI shows up missing from the first lease draft, and now you are the one asking for a concession instead of confirming one already agreed. Confirming an agreed point is easy; extracting a new one against a deadline is not. The LOI sets the anchor for everything that follows, and you hold maximum leverage before you have spent a dollar on architects, space planners, permits, or legal review.

How binding an LOI really is

The honest answer is that it depends on the exact words used and on how the parties behave afterward—which is exactly why precision matters more here than almost anywhere else in the deal. An LOI is not automatically safe just because everyone calls it "non-binding." Courts look at the parties' intent and their conduct, not just the label pasted on the top of the page.

Three rules keep you protected. First, say it is non-binding, explicitly. Include a clear statement along the lines of: "This LOI is a non-binding expression of interest and creates no obligation to lease except for the binding provisions identified below. No party is bound unless and until a definitive lease is fully executed by both parties." Without language like this, courts in some states can infer an enforceable agreement from an LOI plus conduct—a deposit paid, possession taken, or an "agreement to agree" that both sides treated as a done deal.

Second, make a few provisions binding on purpose. You usually *want* these to bind: confidentiality, exclusivity or a no-shop clause (so the landlord cannot shop your terms to other tenants for 30–60 days), governing law, and sometimes a limited good-faith negotiation obligation. These protect you during the exact window when you are spending real money on due diligence, and they cost the landlord nothing legitimate.

Third, keep the economics non-binding. Rent, TI, term, and every contingency should bind only in the signed lease, so you retain the right to walk if diligence turns up a problem—a bad build condition, a title or zoning issue, a financing shortfall, or a hidden use restriction. The classic trap is an LOI that stays silent on bindingness, includes a deposit, and uses committed language like "Tenant shall lease the premises." That combination can be argued into a binding contract in front of a judge, so remove ambiguity everywhere.

Drawing the binding-versus-non-binding split

A well-built LOI draws a clean, explicit line between what is enforceable from signature and what stays open until the lease closes. Getting this line wrong—or leaving it blurry—is how a preliminary document becomes an accidental contract that traps a party who never meant to be bound.

On the non-binding side, the deal can still die without penalty: base rent, escalations, term, TI allowance, free rent, square footage, delivery condition, and all contingencies. These should bind only at lease signing. On the binding side, enforceable from signature: confidentiality, the exclusivity or no-shop period, governing law, and a plain statement that nothing else binds without a fully executed lease. Any good-faith deposit held during LOI negotiation should be fully refundable if the deal doesn't close for a permitted reason—never put non-refundable money down at the LOI stage.

Drawing this line protects you in both directions at once. The landlord cannot enforce the economics against you if diligence goes sideways, but you *can* enforce the no-shop so the landlord doesn't quietly auction your deal to a competitor while you pay for surveys, test fits, and space plans. To make the split unmistakable, label the sections inside the document itself. A well-drafted LOI states plainly: "This Letter of Intent is non-binding except for the provisions regarding Confidentiality, Exclusivity, and Governing Law, which are legally binding upon execution." That one sentence resolves the ambiguity that the overwhelming majority of enforcement disputes ultimately turn on.

Why leverage peaks at the LOI stage—and how to use it

The LOI stage is where you hold the most leverage and carry the least sunk cost, and those two facts are directly linked. Once you have paid an architect, ordered a space plan, or told your team a move date, your negotiating position erodes with every dollar and every week. Landlords know your walk-away power shrinks over time, so the window to press for terms is *now*, while it is still cheap to say no.

Anchor every number you care about. First numbers stick—that is the anchoring effect at work in a negotiation. If you want $35 per square foot in base rent with $60 per square foot in TI, put those exact figures in the LOI; you will rarely improve them later, and you will far more often merely defend them. Win the no-shop. A 30-to-60-day exclusivity stops the landlord from playing you against other prospects while you spend money on due diligence, and it is one of the few things you genuinely want to be binding from signature. Flag every clause you will demand in the lease. Name relocation-clause deletion, co-tenancy, exclusive-use, HVAC repair caps, and any kick-out right now, so none of them lands as a "surprise ask" in the first draft.

Keep deposits refundable and small. A modest good-faith deposit is fine; a non-refundable one at the LOI stage is a red flag that should be pushed back on hard, because it puts your money at risk while every economic term is still open. Set the outside dates. Target dates for lease execution, delivery of the premises, and rent commencement give the deal momentum and accountability, and a realistic drop-dead date protects you from an open-ended negotiation that quietly runs past your own move deadline. A strong tenant-rep broker runs the LOI at no direct cost to you—the landlord typically pays the commission out of the deal—and routinely turns a landlord's one-sided LOI into a tenant-protective one before a single lawyer's hour is billed.

Mistakes that turn an LOI into a trap

Even experienced tenants make costly errors at this stage precisely because the document *feels* preliminary and low-stakes. The most damaging mistakes cluster into a handful of predictable patterns, and every one of them is avoidable with a slower read and a red pen.

Leaving bindingness silent. Always state it explicitly, in both directions—what binds and what does not. Ambiguity is exactly how a non-deal becomes an enforceable one when conduct is layered on top. Letting economics bind early. Rent, TI, and contingencies should bind only at lease signing, never in the LOI itself; if the landlord insists otherwise, that is a signal to slow down. Skipping the no-shop. Without exclusivity, the landlord can shop your negotiated terms to drive a competing bid while you sink money into diligence, then use that bid to reprice you. Accepting non-refundable deposits. Keep good-faith money fully refundable until the lease closes.

Two more traps are quieter but just as expensive. Vague or ambiguous language—terms like "reasonable TI allowance" or "market rent"—invites disputes and lets the stronger party fill the blank later; be specific instead, such as "$50 per square foot in tenant-improvement allowance" or "annual base rent of $24 per square foot, triple net." And missing key terms—an LOI that omits renewal options, expansion rights, termination clauses, or operating-expense (CAM) caps forces you to negotiate those under the pressure of a nearly signed lease, which is the worst possible moment. Include all major business points upfront. Have a real estate attorney review the LOI before you sign it, even though it is "non-binding"; a few hours of legal review at this stage can prevent months of costly disputes and a lease you regret.

When courts have treated an LOI as binding

Although LOIs are designed to be non-binding, courts sometimes enforce them as contracts under specific circumstances—and knowing those circumstances is precisely how you steer around them rather than into them.

Enforcement risk rises sharply when the LOI contains all essential terms and the parties then act as if a deal already exists. If the tenant starts paying rent or the landlord begins construction based on the LOI, both sides have demonstrated intent to be bound, and a court may find an implied contract even without a signed lease. Risk also rises when parties use committed "binding" language by accident—a stray phrase like "this agreement shall be binding upon execution" can create an enforceable obligation even when a preliminary, non-committal step was what everyone actually intended.

Partial performance is a third path to enforcement. If one party takes significant action in reliance on the LOI—the tenant hires an architect and orders long-lead materials, or the landlord demolishes existing improvements to prepare the space—the other party may be estopped from denying the LOI's effect under the doctrine of promissory estoppel, which can produce damages even in the absence of a formal lease. Finally, state-specific law matters a great deal. Some jurisdictions apply stricter rules about what constitutes a binding agreement, and a signed LOI containing all material terms may be treated as a preliminary contract that at minimum requires good-faith negotiation of the remaining points. To reduce all of this exposure, put a bolded disclaimer at the very top of the document: "THIS LETTER OF INTENT IS NON-BINDING AND DOES NOT CREATE A LEGALLY ENFORCEABLE OBLIGATION UNLESS AND UNTIL A FORMAL LEASE IS SIGNED BY BOTH PARTIES." Clear words at the top, and disciplined conduct afterward, are what keep an LOI in the preliminary lane where it belongs.

Related questions

How long does an LOI stay valid?

An LOI usually includes an expiration or drop-dead date, often ranging from a few days to a few weeks. If no date is specified, it may stay open for a reasonable period, but either party can typically withdraw before acceptance unless a binding clause says otherwise.

What is the difference between an LOI and a term sheet?

They are very similar. An LOI is often more formal and may include binding clauses, while a term sheet is usually a simpler, non-binding list of key terms. In practice the names are used interchangeably, so always read the document's actual language for binding intent.

What happens if I sign an LOI and then back out?

Backing out before a full lease is signed generally carries no penalty on the non-binding economic terms. But you could be liable if you breach a binding section—violating a confidentiality clause or an exclusivity provision that barred you from negotiating elsewhere during the window.

Can a verbal LOI be enforceable?

Usually not. Real estate leases typically require a written agreement under the statute of frauds. A verbal understanding might create a business or moral obligation, but courts rarely enforce it as a contract without written evidence or clear partial performance by one of the parties.

FAQ

Can a Letter of Intent be legally binding?

Yes, but generally only the specific sections both parties agree to make binding—confidentiality, exclusivity, or a no-shop clause. The main business terms like rent and square footage are typically non-binding, though courts may enforce them if the language is clear and both sides plainly intended to be bound.

What happens if I sign an LOI and then back out?

If you back out before signing a full lease, you generally face no penalty for the non-binding terms. However, you could be liable for breach if you violate a binding section, such as a confidentiality agreement or an exclusivity clause that prevented you from negotiating with other landlords during the exclusivity window.

Do I need a lawyer to review an LOI?

It is strongly recommended, even though the LOI is mostly non-binding. A lawyer can spot hidden binding language, confirm the terms align with your goals, and flag issues like an overly broad exclusivity clause that could lock you out of pursuing better deals during the negotiation window.

What is a no-shop or exclusivity clause?

It prohibits the landlord from negotiating with other prospective tenants for a set period, commonly 30 to 90 days, and can also restrict the tenant from pursuing other spaces. It protects you while you spend money on due diligence, and violating it can create liability for lost-opportunity costs.

Should an LOI deposit be refundable?

At the LOI stage, yes. Any good-faith deposit should be fully refundable if the deal doesn't close for reasons outside a binding obligation. A non-refundable deposit before a lease is signed is a red flag and puts your money at risk while the economics remain entirely non-binding.

Does "good faith" negotiation language create a binding obligation?

It can. A duty to negotiate in good faith is vague and interpreted differently across jurisdictions, which can lead to bad-faith accusations if a party walks abruptly. Clarify in the document that either party may withdraw for any reason, or no reason, before the full lease is executed.

Sources

• https://www.americanbar.org/groups/real_property_trust_estate/
• https://www.naiop.org/
• https://www.boma.org/
• https://www.irem.org/
• https://www.cbre.com/insights
• https://www.jll.com/en-us/insights
• https://www.cushmanwakefield.com/en/united-states/insights
• https://www.uscourts.gov/
• https://www.law.cornell.edu/wex/letter_of_intent

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