When negotiating commercial real estate in Chicago — whether for office space, retail, or medical office locations — tenants often encounter a foundational document before the lease: the Letter of Intent (LOI). Understanding how an LOI differs from a full Commercial Lease Agreement can save business owners time, money, and legal risk.
This comprehensive guide explores:
- What an LOI is
- How it compares to a commercial lease
- Legal implications
- Chicago market trends
- Best practices for tenants and tenant representation
What Is a Letter of Intent (LOI)?
A Letter of Intent (LOI) is a preliminary agreement that outlines the basic terms of a future commercial lease. It is used to establish mutual understanding between a landlord and tenant before drafting a binding lease.
Key features:
- Summarizes economic terms (rent, TI allowance, lease length)
- Expresses intent to negotiate
- Can include contingencies (due diligence, approvals)
Typical Items in an LOI
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| Term | Description |
|---|---|
| Premises | Address, suite number, and square footage of the space. |
| Lease Term | Length of the proposed lease in years. |
| Base Rent | Annual rent amount and scheduled escalations. |
| Tenant Improvements (TI) | Allowance provided by landlord or allocation of build-out responsibilities. |
| Security Deposit | Amount required as financial security. |
| Contingencies | Due diligence period, financing approvals, or other conditions. |
What Is a Commercial Lease?
A Commercial Lease Agreement is a legally binding contract between a landlord and tenant that governs the terms for occupancy of a commercial property.
It includes:
- Full legal descriptions
- Rights and obligations
- Default remedies
- Insurance requirements
- Maintenance obligations
LOI vs Commercial Lease: Key Differences
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| Feature | Letter of Intent (LOI) | Commercial Lease |
|---|---|---|
| Legal Status | Generally non-binding (except specific clauses) | Fully legally binding contract |
| Level of Detail | Broad economic terms | Comprehensive legal and operational terms |
| Purpose | Establish negotiation framework | Define enforceable rights and obligations |
| Risk Exposure | Limited | High if improperly negotiated |
| Timing | Before lease drafting | Final agreement stage |
| Negotiation Focus | Business terms and structure | Legal protections and risk allocation |
Is an LOI Legally Binding?
An LOI can be partially binding. Certain clauses — such as exclusivity or confidentiality — may be enforceable. However, most LOIs are intentionally drafted as non-binding to allow flexibility.
Binding vs Non-Binding Clauses
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| Clause | Typically Binding? | Notes |
|---|---|---|
| Confidentiality | Yes | Protects sensitive financial and negotiation information. |
| Exclusivity | Yes | Prevents landlord from negotiating with other tenants during the LOI period. |
| Economic Terms | No (usually) | Outline rent, lease term, and TI allowance but are generally non-binding. |
| Legal Obligations | No | Full legal responsibilities are defined later in the commercial lease. |
| Due Diligence Period | No | Allows tenant to review property condition and documentation before lease execution. |
Why Chicago Tenants Use LOIs
In the Chicago market, LOIs are common due to:
1. Competitive Properties
Properties in the Loop, River North, or Near North can lease quickly. An LOI signals serious intent.
2. Negotiation Clarity
Outlines key business terms before law firm drafting begins.
3. Speed
Reduces time spent on full lease negotiation.
Common Chicago LOI Components
A standard LOI in Chicago may include:
- Lease commencement date
- Base rent and annual increases (rent escalations)
- Common Area Maintenance (CAM) charge allocations
- Tenant Improvement (TI) allowances
- Options to renew
- Due diligence period
- Parking arrangements
Practical Example: LOI in Chicago Office Lease
Suppose a dental practice in Schaumburg is negotiating lease terms. An LOI might state:
- 5-year lease
- 8,000 sq ft
- $32/SF base rent
- $50/SF TI allowance
- First right of renewal
- 60-day due diligence
The LOI does not obligate a signed lease — only outlines the expected terms.
The Risks of Entering Commercial Lease Directly
Failing to use an LOI can expose tenants to:
- Ambiguity in economic terms
- Lost negotiation leverage
- Misaligned expectations
- Legal surprises in lease language
Signs an LOI Should Be Negotiated More Deeply
Tenants should scrutinize:
Rent Escalations
Incremental increases that may outpace market.
CAM Charges
Sometimes poorly defined in LOI → dispute later.
Renewal Options
Terms may be vague.
Tenant Improvement Allowances
May need clarification about timing & use.
Chicago Market Trends (2024–2026)
Below is a summary of recent trends in commercial leasing that impact LOI negotiation:
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| Sector | Avg. Base Rent (PSF) | Vacancy Rate | Avg. TI Allowance (PSF) | Concession Trend | Market Leverage | 2024–2026 Notes |
|---|---|---|---|---|---|---|
| Office – Downtown Chicago | $40 – $55 | 22% – 25% | $70 – $110 | High free rent (6–12 months common) | Tenant-favorable | Elevated vacancy continues to increase tenant negotiation power; landlords offering aggressive concessions. |
| Office – Suburban (Naperville, Schaumburg) | $28 – $38 | 15% – 18% | $50 – $85 | Moderate free rent (3–8 months) | Balanced to tenant-leaning | Healthcare and professional services driving demand; suburban repositioning ongoing. |
| Medical Office | $36 – $48 | 8% – 12% | $40 – $75 | Limited concessions | Balanced market | Stable demand; healthcare expansion in North Shore and western suburbs. |
| Retail – High Traffic Corridors | $30 – $45 | 10% – 14% | $30 – $60 | Negotiable build-out support | Location dependent | Strong performance in experiential and service-based categories. |
| Industrial – Suburban Chicago | $12 – $22 | 4% – 7% | Minimal TI | Limited concessions | Landlord-favorable | Low vacancy sustained by logistics growth and supply chain demand. |
Source: Chicago CRE Reports, 2025
How Tenant Representation Helps
A tenant representative (broker) protects tenant interests vs landlord’s broker. This includes:
- Drafting LOI language
- Market comparables
- Negotiation strategy
- Lease risk review
Best Practices for Chicago Tenants
1. Get Competitive Market Data
Compare similar properties before agreeing to LOI terms.
2. Involve Legal Early
A real estate attorney can prevent pitfalls in lease language.
3. Clarify Binding Clauses
Specify which parts of LOI are binding vs non-binding.
4. Confirm Financial Terms
Double-check rent, TI allowance, real estate taxes, and CAM.
How to Structure an LOI for Maximum Leverage
Step 1. State Clear Terms
Base rent, lease length, TI allowance.
Step 2. Add Contingencies
Due diligence timeframes, financing approval.
Step 3. Specify Non-Binding vs Binding
Define which sections are binding (e.g., exclusivity).
Step 4. Attach Market Data
Appended comps strengthen negotiation.
Sample LOI Language
This Letter of Intent is intended to outline the terms for the lease of
Suite A, 123 Main Street, Chicago, IL, between Landlord and Tenant. This
LOI is non-binding except for paragraphs 5 (Confidentiality) and 7
(Exclusivity). Lease term proposed is 60 months at $37.50/SF with TI
allowance $45/SF payable at lease execution. Tenant shall complete
due diligence within 45 business days of LOI acceptance.
Is a Letter of Intent legally binding?
A standard LOI is generally non-binding except for specific clauses like confidentiality or exclusivity. Full lease obligations are defined later in the lease agreement.
Do I need an attorney for an LOI?
No, but having a broker that is also a real estate attorney ensures binding language is properly defined and protects tenant interests.
Can LOI terms be renegotiated later?
Yes. LOIs are negotiation documents. Final lease terms can change, but LOIs set initial expectations.
Does an LOI guarantee the property?
Only if an exclusivity clause is included. Without one, the landlord may entertain other offers.
Conclusion
Understanding the difference between a Letter of Intent (LOI) and a Commercial Lease Agreement is essential for any tenant in the Chicago commercial real estate market. An LOI sets the foundation, clarifies key economic terms, and reduces risk before legally binding lease language is drafted.
With proper tenant representation, market data, and legal input, tenants can negotiate from a position of strength — ensuring favorable terms and long-term business success.
