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What business owners should know before signing a commercial lease

Base rent vs. additional rent, term and renewal, TI allowances and personal guarantees — the terms that matter most.

7 min read · Updated July 12, 2026

A commercial lease is often a business's largest fixed commitment, and unlike residential tenancies there's very little consumer protection — the terms are whatever you negotiate. Understanding the structure before you sign is essential.

Base rent is only part of the rent

Most commercial leases are "triple net" (NNN): on top of base rent you pay additional rent — your proportionate share of property taxes, insurance and common-area maintenance. Always ask for the current additional rent per square foot, not just the base, so you're comparing real occupancy cost.

Term, renewal and the option

Landlords want term; you want flexibility. Negotiate:

  • A term that matches your business plan, not the landlord's amortization
  • A renewal option at a defined rate or market rate, so you're not held hostage at expiry
  • Early-termination or assignment/sublet rights if your needs change

Tenant improvements

Fitting out a space is expensive. A tenant improvement (TI) allowance — a per-square-foot contribution from the landlord toward your build-out — is standard and negotiable, especially on longer terms. Get the scope and who owns the improvements at end of term in writing.

The fine print that bites

  • Personal guarantees — landlords often want one; try to cap or burn it off over time
  • Demolition/relocation clauses — can end your lease early for redevelopment
  • Use and exclusivity — make sure your permitted use is broad enough, and consider an exclusivity clause so a competitor can't move in next door
  • Restoration obligations — what you must return the space to at the end

Get representation

Landlords have professional leasing agents; tenants should too. Tenant representation typically costs you nothing directly and routinely pays for itself in improved terms.

Looking at space? Start a commercial enquiry and we'll represent your side.

Thinking about your next move?

Whether you're buying, selling, or just weighing your options, a real person at Renanza will get back to you.