Below is a template commercial lease termination notice for an alleged violation of a no-subletting / no-assignment clause with a 30-day cure period. Because the required legal citations, notice periods, and wording vary significantly by state, county, city, and the lease itself, I’ve provided:

1. a practical template you can adapt, and
2. a citations section showing where to insert the correct governing law.

If you want, I can also redraft this for a specific state/jurisdiction and make the citations exact.

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COMMERCIAL LEASE NOTICE OF DEFAULT AND NOTICE OF TERMINATION

(Unauthorized Subletting / Assignment – 30-Day Cure Notice)

[LANDLORD NAME]
[Landlord Address]
[City, State, Zip]
[Phone]
[Email]

Date: [DATE]

Via: [Certified Mail / Return Receipt Requested / Personal Delivery / Overnight Courier / Email, if permitted by lease]

To:
[TENANT NAME]
[Tenant Address]
[City, State, Zip]

Re: Notice of Default and Notice of Termination of Commercial Lease
Premises: [PROPERTY ADDRESS / SUITE NUMBER]
Lease Date: [LEASE DATE]

Dear [Tenant Name]:

This letter serves as formal Notice of Default and Notice of Termination under the Commercial Lease dated [LEASE DATE] between [LANDLORD NAME] (“Landlord”) and [TENANT NAME] (“Tenant”) concerning the premises located at [PROPERTY ADDRESS / SUITE NUMBER] (“Premises”).

1. Default Under Lease

Landlord has determined that Tenant is in default of the Lease by engaging in an unauthorized sublease, sublicense, assignment, occupancy transfer, or other transfer of possession or occupancy rights involving all or part of the Premises without Landlord’s prior written consent, in violation of Section [SECTION NUMBER] of the Lease.

Specifically, Landlord has reason to believe that:

• [NAME OF UNAUTHORIZED OCCUPANT / ENTITY], and/or
• [DESCRIPTION OF CONDUCT: e.g., “a third party business has been occupying or operating from the Premises since approximately [DATE]”], and/or
• [DESCRIPTION OF EVIDENCE: signage, business listings, employee statements, separate occupancy, rent paid by third party, etc.]

This conduct constitutes a breach of the Lease provision stating that Tenant shall not sublet, assign, license, or otherwise transfer any interest in the Lease or Premises without Landlord’s prior written consent.

2. Demand to Cure Within 30 Days

Pursuant to Section [DEFAULT SECTION NUMBER] of the Lease and [INSERT GOVERNING STATUTE / COMMON LAW AUTHORITY / NOTICE PROVISION], Tenant is hereby given thirty (30) days from service of this Notice to fully cure the default.

To cure the default, Tenant must, on or before [CURE DEADLINE DATE], do all of the following:

1. Immediately cease the unauthorized subletting, assignment, licensing, or occupancy arrangement;
2. Remove any unauthorized occupant or transferee from the Premises;
3. Provide written confirmation to Landlord that the unauthorized arrangement has been fully terminated; and
4. Provide supporting documentation, if requested by Landlord, sufficient to verify that no unauthorized third party remains in possession or occupancy of any portion of the Premises.

If the Lease permits Landlord to approve a transfer retroactively, Landlord reserves the right, in its sole discretion and without waiver, to require a complete application and supporting materials for review; however, nothing in this Notice shall be construed as Landlord’s consent to any past, present, or future sublease, assignment, or transfer.

3. Termination if Default Is Not Timely Cured

If Tenant fails to fully cure the default within the 30-day cure period, then the Lease shall terminate effective [TERMINATION DATE], without further notice except as may be required by applicable law. Tenant shall then be required to:

• vacate and surrender the Premises;
• remove all personal property as required by the Lease;
• restore the Premises as required by the Lease; and
• remain liable for all rent, additional rent, damages, costs, attorneys’ fees, and other sums recoverable under the Lease and applicable law.

Landlord expressly reserves all rights and remedies for default, possession, damages, holdover rent, injunctive relief, and collection, whether under the Lease or applicable law.

4. No Waiver

Nothing in this Notice, and no prior acceptance of rent or other conduct by Landlord, shall constitute a waiver of this default, any prior default, or any future default. Landlord expressly reserves all rights, claims, defenses, and remedies.

5. Method of Service

This Notice is being served in the manner required by the Lease and applicable law, including [DESCRIBE METHOD OF SERVICE].

Please govern yourself accordingly.

Sincerely,

[LANDLORD NAME / PROPERTY OWNER / AUTHORIZED AGENT]

By: __________________________
Name: [NAME]
Title: [TITLE]

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Optional Proof / Certificate of Service

I certify that on [DATE], I served this Notice of Default and Notice of Termination on [TENANT NAME] by:

• Certified Mail, Return Receipt Requested
• Personal Delivery
• Overnight Delivery
• Posting and Mailing
• Email (if authorized under lease)
• Other: __________________

Signature: __________________________
Name: [NAME]
Date: __________________

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Legal Citation Placeholder Language

Because you asked for “proper legal citations,” here is how that should be handled:

In the notice itself, cite:

1. The lease provisions

   • No-subletting / no-assignment clause: “Section [X] of the Lease”
   • Default and remedies section: “Section [Y] of the Lease”
   • Notice section: “Section [Z] of the Lease”

2. The governing state statute or common law authority, if applicable
   Examples might include:

   • state commercial landlord-tenant statutes,
   • unlawful detainer / summary eviction statutes,
   • contract law principles governing lease defaults,
   • local notice statutes if they apply to commercial tenancies.

Example citation format

You can insert a clause like this:

“This Notice is given pursuant to Sections [X], [Y], and [Z] of the Lease and [State Statute Citation], including any applicable unlawful detainer or commercial eviction provisions.”

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Important drafting note about the “30-day cure period”

A 30-day cure period is not universal for commercial lease violations. In many jurisdictions, the cure period is controlled primarily by:

• the lease language, and/or
• the state’s commercial eviction/unlawful detainer statute.

In some places, unauthorized assignment/subletting may permit:

• a shorter notice period,
• immediate default if designated incurable,
• or a notice to quit rather than a cure notice.

So if you want “proper legal citations,” the notice should be tailored to the exact jurisdiction.

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Safer citation-ready version

Here is a slightly more formal version of the key sentence:

Tenant is in default under Section [X] of the Lease for subletting, assigning, licensing, or otherwise transferring possession or occupancy rights in the Premises without Landlord’s prior written consent. Pursuant to Sections [Y] and [Z] of the Lease, and further pursuant to [INSERT APPLICABLE STATE STATUTE / LOCAL CODE], Tenant is hereby notified of such default and provided thirty (30) days after service of this Notice to cure.

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Recommended jurisdiction-specific citation examples

If you want exact legal citations, I need:

• State
• City/County
• Whether the lease says anything specific about:
  • subletting,
  • default notices,
  • cure periods,
  • method of service.

Then I can produce a final version with actual citations such as, for example:

• California: cite the lease plus relevant unlawful detainer statutes if applicable,
• Texas: cite the lease and Texas Property Code provisions if relevant,
• New York: cite lease terms and RPAPL / common law as appropriate,
• etc.

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Practical caution

I’m not a lawyer, and a termination notice is a legal enforcement document. If the notice is defective, it can delay eviction or waive rights. Before sending, you should ideally have local counsel confirm:

• the notice period,
• whether the breach is curable,
• exact statutory citation,
• service method,
• whether a separate notice to quit is required after cure expires.

If you want, send me:

1. the state/jurisdiction, and
2. the lease clause text,

and I’ll turn this into a jurisdiction-specific final notice with exact citations.

Disclaimer: I am an AI, not an attorney. Landlord-tenant law, particularly regarding commercial evictions and notice periods, varies significantly by state and local jurisdiction. This draft is a template provided for informational purposes only. You must consult with a qualified real estate attorney in your jurisdiction to ensure the statutory citations, notice periods, and delivery methods comply with your specific state laws and the exact terms of your lease.

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VIA CERTIFIED MAIL, RETURN RECEIPT REQUESTED AND FIRST-CLASS MAIL (Also post directly on the door of the premises if required by local statute)

DATE: [Insert Date]

TO: [Insert Tenant Business Name] Attn: [Insert Name of Guarantor or Tenant Principal] [Insert Tenant Address/Premises Address] [City, State, Zip Code]

RE: NOTICE OF DEFAULT AND OPPORTUNITY TO CURE (30-DAY NOTICE TO CURE OR QUIT) PREMISES: [Insert Exact Address of the Leased Commercial Property including Suite/Unit #]

Dear [Insert Tenant Name]:

Please be advised that you are in material breach of the Commercial Lease Agreement legally executed on [Insert Date of Lease], by and between [Insert Landlord Name] ("Landlord") and [Insert Tenant Name] ("Tenant") for the commercial premises located at [Insert Premises Address] (the "Premises").

1. NATURE OF THE DEFAULT You are in default of the Lease for assigning or subletting the Premises without the prior written consent of the Landlord. It has come to our attention that you have subleased all or a portion of the Premises to, or otherwise permitted the occupancy of the Premises by, an unauthorized third party, currently believed to be [Insert Name of Unauthorized Subtenant or Business, or write "an unknown third party"].

2. VIOLATION OF LEASE TERMS This unauthorized subletting is a direct and material violation of Section [Insert Section Number, e.g., 14.1] of the Lease, which strictly stipulates:

"[Insert the exact language from your lease prohibiting subletting/assignment. Example: 'Tenant shall not assign, transfer, mortgage, pledge, or otherwise encumber this Lease, or sublet or rent the Premises or any part thereof, or permit the Premises to be occupied by any other person or business, without the prior written consent of the Landlord...']"

Because Landlord did not grant written consent to this sublease/occupancy arrangement, you are in breach of the Lease.

3. OPPORTUNITY TO CURE (30-DAY NOTICE) Pursuant to Section [Insert Section number regarding defaults/remedies] of your Lease and applicable state law, you are hereby given thirty (30) days from the date of the service of this Notice to cure this default.

To cure this default, you must completely remove the unauthorized subtenant/occupant from the Premises, cease any operations by unauthorized third parties, and restore your sole and exclusive possession of the Premises no later than [Insert Deadline Date, ensuring it is at least 30 days from the date of legally validated delivery].

4. LEGAL CITATION AND CONSEQUENCES OF FAILURE TO CURE This Notice is served pursuant to [Insert State] law, including [Insert exact state statutory citation, e.g., California Code of Civil Procedure § 1161(3) OR New York Real Property Actions and Proceedings Law § 711(1) OR Texas Property Code § 93.002], which governs commercial lease defaults and unlawful detainer.

If you fail to cure this default within the thirty (30) day period prescribed above, the Landlord will elect to immediately terminate your Lease and right to possession of the Premises. Subject to state law, the Landlord will promptly commence legal proceedings (an unlawful detainer/eviction action) to recover possession of the Premises.

Furthermore, you will be held liable for all damages as permitted under the Lease and state law, including but not limited to unpaid rent, future lost rent, court costs, and reasonable attorneys' fees incurred by the Landlord in enforcing the terms of the Lease.

5. RESERVATION OF RIGHTS This Notice is given without prejudice to any other rights or remedies that Landlord may have under the Lease, at law, or in equity. The acceptance of partial rent by the Landlord shall not be deemed a waiver of this Notice or the default described herein.

Govern yourself accordingly.

Sincerely,

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[Insert Landlord/Property Manager Signature]

[Insert Printed Name of Landlord/Property Manager] [Insert Title/Company] [Insert Contact Phone Number] [Insert Contact Email]