When you lease commercial space, the raw square footage is only the beginning. An empty shell needs walls, flooring, lighting, and plumbing before your business can open its doors. That build-out costs real money, and who pays for it is one of the most important negotiations in any commercial lease.
The answer is often the tenant improvement allowance, usually called the TI allowance or TIA. It is a contribution from the landlord toward fitting out your space, and it can be worth tens or even hundreds of thousands of dollars. It is also one of the easiest concessions to misjudge, because the headline number rarely equals what you actually get to spend.
This guide explains how tenant improvement allowances work, how they are quoted, the three common structures landlords offer, who owns the improvements when the lease ends, and what happens to any allowance you do not use. If you are negotiating a commercial lease, this is money you cannot afford to misunderstand.
What Is a Tenant Improvement Allowance?
A tenant improvement allowance is a clause in a commercial lease under which the landlord pays for, or reimburses, all or part of the cost of fitting out the tenant’s space. You will also see it written as TI, TIs, TIA, or leasehold improvement allowance. All of these refer to the same concept.
Landlords offer TI because a fitted-out space is easier to lease and worth more at the end of the term. Tenants want it because building out raw space is expensive, and every dollar the landlord contributes is a dollar of capital the business keeps. The allowance is a capital investment by the landlord, made in exchange for a signed lease that typically carries higher rent, a longer term, or both.
The allowance is always negotiable. It grows with lease length, the tenant’s financial strength, and market conditions. A five-year lease from a strong tenant in a soft market commands far more TI than a two-year lease in a tight one. Never accept the first figure the landlord offers. If you are just getting started with commercial leasing, our overview of what a lease agreement is provides useful background.
How TI Is Quoted: The Per-Square-Foot Math
TI allowances are typically expressed as a dollar amount per rentable square foot. The calculation is simple: multiply the rentable square footage by the negotiated rate. A 5,000 square foot space with a $20 per square foot allowance gives you $100,000 to work with.
Typical amounts vary widely by space type and market. For brand-new space, landlords commonly offer $25 to $40 per square foot. In previously occupied space that needs less work, the negotiation often lands at $20 or less per square foot. Recent 2026 market data for Southern California shows the range even more clearly: Class A office for a new long-term tenant runs $80 to $120 per square foot, Class B office $45 to $75, retail $25 to $50, restaurants $80 to $150 or more, industrial as little as $5 to $20, and medical office $80 to $150 or more because of specialized mechanical work.
Two important caveats apply to these figures. First, renewal TI for an existing tenant is typically 30 to 60 percent lower than new-lease TI, since the existing build-out reduces the scope of work. Second, the headline number is not your spending budget. Supervision fees, sales tax, and required contractor lists can all quietly reduce what you actually get to spend, so clarify the net amount during negotiations. CommercialCafe’s guide to TI allowances walks through where the money often disappears.
The Three Common Structures
The fixed dollar amount is the simplest and most common structure. The lease states that the landlord will provide an allowance of a set number of dollars per rentable square foot. You control how the money is spent, subject to landlord approval of the plans, and you manage the contractors.
The landlord-built turnkey is the second structure. Here the landlord constructs the improvements to an agreed specification and controls the budget and the contractor. You get a finished space built to the agreed plans, but you have little say in who does the work or how it is managed. Once you approve the layout, changes must be approved and are usually paid for directly by you.
The third structure is the amortized allowance. This works like a loan from the landlord. The landlord funds improvements beyond the base allowance, and you repay the amount over the lease term with interest, folded into your rent payments. For example, sample lease language shows additional TI amortized over the remaining term with interest at 8 percent per year. This structure helps when your build-out costs exceed what the landlord will fund outright, but remember you are paying for the privilege.
What TI Covers and What It Does Not
TI typically covers permanent improvements that become part of the space: interior walls, flooring, ceilings, lighting, HVAC distribution, electrical, and plumbing. These are the bones of a functional workspace, and they stay with the building when you leave.
What the allowance does not cover is equally important. Furniture, cabling, signage, moving costs, and equipment that is not permanently affixed are usually excluded. Landlords also draw lines between hard costs, like labor and materials, and soft costs, like architectural and consulting fees. Some landlords fund hard costs only, or cap soft costs, which reduces your effective budget.
Ask these questions before you sign. What work will the landlord perform before the TI kicks in, such as demolition, HVAC, or restrooms? Who manages the job, and can you choose your own contractors? How are disbursements handled, and what paperwork triggers each payment? The answers determine how far your allowance actually goes.
Who Owns the Improvements?
In most commercial leases, the improvements become the property of the landlord. The tenant spends the allowance on upgrades that are permanently attached to the space, and when the lease ends, those upgrades stay. This is the standard arrangement, and it is one reason landlords are willing to fund TI in the first place.
This can be a point of real contention if you have invested heavily in customizing the space. Consider a medical practice that installs expensive specialized equipment or a restaurant that builds out a commercial kitchen. If the lease does not explicitly state that the tenant retains ownership of specific items, the practice could lose a substantial investment upon vacating.
Protect yourself by negotiating ownership of high-value or specialized items upfront. If certain equipment can be removed without damaging the space, the lease should say so. Otherwise, assume anything you bolt down belongs to the landlord when you walk out. Our comparison of lease assignment versus sublease covers related questions about transferring spaces with improvements in place.
What Happens to Unused Allowance
Most leases state that any undisbursed portion of the TI allowance expires after a deadline, often six months after rent commencement. If you do not spend it in time, you lose it. This use-it-or-lose-it structure makes careful project planning essential.
But the deadline is negotiable, and so is the fate of leftover funds. Some tenants successfully negotiate for unused sums to be applied to future rent payments. Others negotiate to use remaining funds for furniture, fixtures, and equipment, or even to receive a cash reimbursement. These outcomes are not automatic, so raise them during negotiations, not after the build-out is done.
Disbursement mechanics matter too. Many landlords require you to pay the costs first and seek reimbursement only after completion, with final lien waivers and sometimes a certificate of occupancy. For larger projects, negotiate periodic disbursements tied to construction milestones so you are not carrying the full cost while waiting for reimbursement.
Negotiation Tips for a Better TI Deal
Start by getting real construction bids before you negotiate the number. An allowance that sounds generous can fall short once contractors price the work. Walk the space with a contractor, define the scope, and negotiate from actual costs rather than round numbers.
Push for control over the project. A budgeted dollar allowance that you manage gives you far more say over contractors and finishes than a turnkey build-out. If the landlord insists on turnkey, get the specifications in writing with as much detail as possible, and negotiate a clear process for approving changes.
Finally, think about the total deal, not just the TI figure. A landlord offering a smaller allowance but lower rent and a longer free rent period may be giving you the better overall package. NextGen Properties’ 2026 analysis of TI costs offers current market benchmarks you can use to test whether an offer is competitive. Model the full-term economics before you commit.
The Bottom Line
A tenant improvement allowance is one of the most valuable items in a commercial lease, but only if you understand how it works. Know the per-square-foot math, choose the right structure, clarify what is covered, protect ownership of your specialized investments, and negotiate what happens to money you do not spend.
Like every clause in a commercial lease, TI is negotiable. The tenants who get the best allowances are the ones who arrive with construction bids, market data, and competing options. Do your homework, and the build-out becomes an asset instead of a surprise expense.
This article is for educational and informational purposes only. It does not provide personalized legal or financial advice. Consult a qualified attorney or financial professional before negotiating a tenant improvement allowance.