Office Rental Agreements: Commercial Lease Guide

Updated: March 28, 2025 12 min read
Modern office space interior

Office rental agreements are more complex than residential leases, with unique terms, legal considerations, and financial structures designed for commercial use. Understanding these differences is essential for business owners looking to lease workspace.

What is an Office Rental Agreement?

An office rental agreement, also called a commercial lease, is a legally binding contract between a property owner (landlord) and a business tenant that outlines the terms and conditions for renting office space. These agreements are typically longer, more detailed, and more negotiable than residential leases.

Office rental agreements typically include:

  • Property description with exact measurements of the leased space
  • Lease term (often 3-10 years, compared to 1 year for residential)
  • Rent amount, escalation clauses, and payment terms
  • Tenant improvement allowances and buildout specifications
  • Common area maintenance (CAM) fees and calculations
  • Utility and service responsibilities
  • Operating expense allocations
  • Use restrictions and compliance requirements
  • Signage and branding rights
  • Option to renew, expand, or terminate early

Types of Office Rental Agreements

Gross Lease

In a gross lease, tenants pay a fixed rent amount while the landlord covers most operating expenses (taxes, insurance, maintenance). This is simpler for tenants but typically comes with a higher base rent to offset the landlord's costs. Rent increases may be built in to account for rising expenses.

Net Lease

Net leases require tenants to pay some portion of the building's operating expenses in addition to base rent:

  • Single Net (N): Tenant pays rent plus property taxes
  • Double Net (NN): Tenant pays rent plus property taxes and insurance
  • Triple Net (NNN): Tenant pays rent plus property taxes, insurance, and maintenance costs

Triple net leases typically have lower base rent since the tenant assumes more operational costs.

Modified Gross Lease

A hybrid between gross and net leases, where the tenant and landlord share certain expenses. Typically, the tenant pays base rent plus increases in operating expenses over a "base year" (usually the first year of the lease).

Percentage Lease

Common in retail but occasionally used for office space, these leases include a base rent plus a percentage of the tenant's gross revenue. This structure aligns the landlord's interests with the tenant's business success.

Key Components of Office Rental Agreements

Space Measurement and Description

Office spaces are typically measured in rentable square feet (RSF), which includes the usable area plus a portion of common areas. The lease should clearly define how space is measured (often according to BOMA standards) and include floor plans.

Lease Term and Renewal Options

Commercial leases typically run 3-10 years, significantly longer than residential leases. Renewal options give tenants the right to extend the lease under specified terms, providing business stability while maintaining flexibility.

Rent Structure and Escalations

Office leases usually include annual rent increases (escalations), which may be fixed percentage increases, tied to CPI (Consumer Price Index), or based on actual operating expense increases. The lease should specify exactly how and when these escalations are calculated and applied.

Tenant Improvements (TI)

Office spaces often require customization before occupancy. The lease should detail any TI allowance provided by the landlord, the scope of permitted improvements, approval processes, ownership of improvements, and restoration requirements upon lease termination.

Common Area Maintenance (CAM)

CAM charges cover expenses for shared areas like lobbies, elevators, restrooms, and parking lots. The lease should specify how these costs are calculated, what's included, and any caps on annual increases.

Assignment and Subletting

These clauses govern whether and how a tenant can transfer the lease to another business or sublet a portion of the space. Commercial leases often require landlord approval for such transfers but may include more flexibility for growing businesses.

Creating an Office Rental Agreement

Due to their complexity, office rental agreements typically require more negotiation and customization than residential leases. Our Rental Agreement Generator can help you create a foundational commercial lease with these steps:

  1. Select property type as "Office" - This activates commercial-specific clauses and language
  2. Enter detailed space information - Include exact square footage, floor, suite number, and common area factor
  3. Specify lease structure - Choose between gross, net, or modified gross terms
  4. Set commercial-specific terms - Define permitted use, operating hours, tenant improvement allowances, and maintenance responsibilities
  5. Add renewal, expansion, or termination options - Include any negotiated future rights
  6. Review and generate - Produce a starting point for your commercial office lease

Important Note: Commercial office leases often involve significant financial commitments and complex legal terms. While our generator provides a solid foundation, we recommend having the final agreement reviewed by a real estate attorney who specializes in commercial leases.

Negotiating Office Leases

Unlike residential leases, commercial office leases are highly negotiable. Key areas to negotiate include:

  • Rent and escalations - Caps on annual increases, rent abatement periods
  • Tenant improvement allowance - Amount and scope of landlord-funded improvements
  • Term length and renewal options - Balance between commitment and flexibility
  • Exit strategies - Sublease rights, early termination options, expansion or contraction rights
  • Operating expense definitions - What's included and excluded from pass-through charges
  • Personal guarantees - Limited vs. unlimited guarantees, burn-off provisions

Legal Considerations for Office Leases

Commercial office leases are governed by different laws than residential leases:

  • Less Consumer Protection - Fewer tenant protections exist for commercial tenants, as businesses are presumed to have more negotiating power and sophistication
  • ADA Compliance - Leases should address responsibilities for Americans with Disabilities Act compliance
  • Insurance Requirements - Commercial leases have more extensive insurance requirements, including general liability, business interruption, and sometimes specific coverage types
  • Zoning and Use Restrictions - Ensure the space is properly zoned for your intended business use

Create Your Office Rental Agreement

Whether you're a business owner seeking new office space or a property owner looking to lease commercial property, a well-crafted office rental agreement is essential for protecting your interests and establishing clear expectations. Our Rental Agreement Generator provides a foundation for creating a customized commercial lease that addresses the unique aspects of office rentals.