This guide covers the rights and responsibilities of both tenants and landlords around improvements, how Tenant Improvement Allowances (TIAs) work, what happens when your lease expires, and how to negotiate terms that protect your interests in competitive markets like Manhattan. Confusion over tenant improvements often leads to costly disputes, delayed buildouts, or unfavorable lease terms. Understanding the rules upfront is essential for growing companies signing long-term leases in high-demand submarkets like Flatiron, NoMad, and Union Square.
TLDR
- Tenant improvements (TIs) are permanent modifications to rental space requiring written landlord consent; proceeding without approval risks lease termination and restoration costs
- Manhattan TIAs averaged $118.65/SF in Q1 2025, but actual buildout costs range from $150-$300/SF, creating significant out-of-pocket exposure for tenants
- Permanently attached improvements become landlord property at lease end unless explicitly negotiated otherwise
- 100% bonus depreciation is available for Qualified Improvement Property acquired after January 19, 2025
- Negotiating restoration obligations upfront can save tens of thousands of dollars at move-out
What Are Tenant Improvements? Definitions, Types, and Examples
Tenant improvements (also called leasehold improvements) are permanent or semi-permanent modifications made to a commercial rental space to make it suitable for a specific tenant's use. They are legally and functionally distinct from routine repairs, which simply restore existing conditions to address habitability or fix damage.
Under the Internal Revenue Code as amended by the Tax Cuts and Jobs Act (TCJA), Qualified Improvement Property (QIP) is defined as "any improvement made to the interior of a nonresidential building after the building is placed in service." This definition consolidated three prior IRS categories — qualified leasehold improvement, qualified restaurant, and qualified retail improvement property — into a single classification, and now serves as the standard reference point for TI definitions in commercial leases.
Improvements vs. Repairs vs. Betterments
The distinction matters for legal, financial, and tax purposes:
- Repairs restore existing conditions — such as fixing a broken HVAC unit, patching cracked drywall, or replacing worn carpet
- Improvements add new value or functionality — such as building out private offices, installing specialized electrical systems, or reconfiguring floor plans
- Betterments are improvements that materially increase the property's market value beyond the tenant's operational needs — for example, upgrading a building's electrical capacity or installing high-end finishes that exceed market standards
Typical Commercial TI Categories
Structural:
- Adding or removing walls and partitions
- Creating open-plan layouts or collaborative work zones
- Building conference rooms or private offices
- Installing glass partition systems
MEP (Mechanical, Electrical, Plumbing):
- Electrical upgrades (wiring, outlets, panel capacity)
- Plumbing modifications for kitchens or restrooms
- HVAC adjustments or supplemental systems
- Data cabling and network infrastructure
Finishes:
- Flooring installation (carpet, hardwood, polished concrete)
- Ceiling work (drop ceilings, acoustic treatments)
- Custom lighting systems
- Paint and wall treatments
Specialty Work:
- Server rooms with dedicated cooling and power
- ADA compliance enhancements (accessible restrooms, ramps, door hardware)
- Custom millwork and cabinetry
- Kitchen buildouts and pantries
What Typically Does NOT Qualify as a TI
Per IRS Publication 946 and standard commercial lease practice, the following are excluded:
- Building-wide system upgrades (elevator replacement, lobby renovations)
- Enlargement of the building footprint
- Escalators and elevators
- Changes to the building's internal structural framework
- Exterior modifications (façade work, signage)
- Furniture, fixtures, and equipment (FF&E) that are not permanently attached
- Portable equipment and technology
- Improvements that benefit all building tenants rather than one specific occupant
Tenant Rights: What You Can (and Can't) Do to a Rented Commercial Space
Virtually all commercial leases include an alterations clause that requires tenants to obtain written landlord consent before making any modifications. Proceeding without approval can expose tenants to lease termination, forced restoration costs at the tenant's expense, and loss of security deposit funds.
The Written Approval Process
In practice, tenants submit a comprehensive package for landlord review:
- Detailed construction drawings and floor plans
- Contractor credentials and insurance certificates
- Itemized budget and project timeline
- Scope of work description
- Samples of proposed materials
Landlords evaluate these submissions against several criteria: impact on building systems, structural integrity, compliance with building codes, and the future marketability of the space. Only after written consent is granted can construction begin.
Legal Status of Fixtures
Once an improvement is physically attached to the property—built-in shelving, ceiling lighting, partition walls, built-in cabinetry—it generally becomes a fixture under property law and the legal property of the landlord, unless the lease explicitly states otherwise.
New York courts apply a three-part test to determine fixture status:
- Annexation — Is the item physically attached in a way that requires effort or damage to remove?
- Adaptation — Was it installed specifically for how this property is used?
- Intention — Did the party installing it intend for it to stay permanently?
A trade fixture, by contrast, refers to items installed specifically to enable the tenant's business operations (such as machinery, specialized shelving, or restaurant equipment) and may be removed by the tenant at lease end, provided removal does not cause material damage.
This matters most at renewal time. NY Real Property Law Section 226-a confirms that a tenant's removal rights survive a lease renewal: "Unless otherwise expressly agreed, where a tenant has a right to remove fixtures or improvements, such right shall not be lost or impaired by reason of his acceptance of a new lease of the same premises without any surrender of possession between terms."
NYC Permit and Code Compliance
The NYC Department of Buildings requires commercial alteration projects to comply with:
- 2014 NYC Construction Codes (Administrative, Building, Plumbing, Fuel Gas, Mechanical)
- NYC Energy Conservation Code
- NYC Electrical Code
- NYC Fire Code
A Registered Design Professional (PE or RA) must serve as Applicant of Record and file complete construction drawings before work begins.
Permit-required work includes structural alterations (columns, beams, bearing walls), MEP system renovations, egress modifications, and vertical or horizontal enlargements. Skipping this step can attach violations directly to the property and create legal liability for both tenant and landlord.
ADA Compliance Triggers
Under 28 CFR Section 36.403, when a commercial tenant alters an area containing a "primary function," the path of travel to that area—and serving restrooms, telephones, and drinking fountains—must be made accessible "to the maximum extent feasible."
The disproportionate cost threshold: improvements required for accessibility are capped at 20% of the total alteration cost. This means a $100,000 office buildout could trigger up to $20,000 in additional ADA-related path-of-travel costs. Build these costs into your TI budget before signing.
Consequences of Unauthorized Improvements
When unauthorized alterations are discovered:
- Landlord documents the violation in writing and may issue a notice to cure
- Tenant may be required to restore the space to original condition at their own expense
- Restoration costs can be deducted from the security deposit or pursued through legal action
- Unauthorized work may constitute an incurable lease default, exposing the tenant to eviction proceedings
One thing landlords and tenants both overlook: even approved improvements need formal written acknowledgment in the lease or a separate agreement. Without it, disputes over ownership, restoration obligations, and security deposit deductions at lease end are almost inevitable.
Landlord Responsibilities: Tenant Improvement Allowances (TIAs) Explained
A Tenant Improvement Allowance (TIA) is a sum of money the landlord agrees to contribute toward the cost of buildout work. It is one of the most heavily negotiated elements of a commercial lease and directly affects total occupancy cost.
TIA Structures: Four Ways Landlords Structure the Deal
How a landlord delivers the TIA matters as much as the dollar amount. Each structure carries different implications for cash flow, control, and risk.
| Structure | How It Works | Best For |
|---|---|---|
| Lump Sum Payment | Landlord pays a set amount upon completion of approved improvements | Tenants who want contractor control and have upfront capital |
| Rent Credit | TIA applied as a monthly credit against rent over the lease term | Tenants prioritizing lower monthly cash outlay |
| Rent Abatement | Landlord offers reduced or free rent for a set period to offset buildout costs | Tenants who need cash flow relief without fronting construction costs |
| Turnkey Buildout | Landlord funds and manages the entire buildout, delivering a finished space | Tenants who want minimal involvement and accept higher base rent |
The timing and form of payment significantly affect cash flow during buildout — especially for early-stage companies that don't have deep reserves.
What a TIA Typically Covers (and What It Doesn't)
Typically Covered:
- Demolition of existing partitions
- New wall construction and partition systems
- Flooring and ceiling finishes
- Painting and wall treatments
- Standard lighting and electrical work
- ADA-compliant fixtures
Typically Excluded:
- Furniture and movable equipment
- Specialty or industry-specific equipment (medical devices, lab equipment)
- Data cabling beyond building standard
- Signage and branding elements
- Moving expenses and relocation costs
When a tenant's planned improvements exceed the TIA, the tenant covers the overage. That makes it critical to submit a detailed budget before the lease is signed. Landlords typically require cost breakdowns, contractor estimates, and progress reporting to confirm funds go toward approved work.
Negotiating Tenant Improvement Terms: What Growing Companies Should Know
TIA amounts are not fixed—they are a function of market conditions, lease length, tenant creditworthiness, and the landlord's urgency to fill the space.
Current NYC Market Benchmarks
Manhattan office TIAs have declined but remain substantially above national averages:
- Manhattan 2024 average: $138.65/SF (Colliers)
- Manhattan Q1 2025 average: $118.65/SF (14.4% decline)
- Midtown trophy properties (2025): $133/SF
- NYC citywide average (2025): ~$120/SF
- National average (2024): $87.51/SF (CBRE)
Yet actual buildout costs in NYC range from $150 to $300/SF, creating a structural gap of $50–$150/SF in out-of-pocket exposure for most tenants. That gap is where negotiation matters most.
Key Negotiating Levers
Three factors most directly influence how much TIA a landlord will offer:
- Lease length: Landlords use generous TI packages to lock in longer terms, which supports their financing when loans come due. A 7- or 10-year lease typically commands a higher TIA than a 3- or 5-year commitment.
- Tenant creditworthiness: Series A+ funded companies and established enterprises negotiate from a position of strength. Landlords view creditworthy tenants as lower-risk and invest more upfront accordingly.
- Landlord carrying costs: A vacant space in a soft market costs the landlord real money—debt service, property taxes, maintenance. In a high-vacancy environment, push for higher TIAs, free rent, or flexible terms using that pressure as leverage.
Negotiate Approval Rights and Timelines
Aim to:
- Shorten approval timelines (e.g., "Landlord to respond within 10 business days")
- Allow tenant's own licensed contractors rather than restricting to landlord-approved vendors, which can inflate costs
- Define "substantially similar" materials upfront to avoid disputes over substitutions during construction
How Nomad Group Supports TI Negotiations
Nomad Group's construction management team has completed 300+ tenant buildouts across NYC and helps clients negotiate TI terms calibrated against real buildout costs—not just market averages. The team manages the full construction process on a 90-day turnaround, reducing the risk of budget overruns or landlord disputes mid-buildout, and delivering a functional space on time and on budget.
Lease-End Obligations: Ownership, Fixtures, and Restoration
At lease expiration, the default legal position is that permanently attached improvements become landlord property—but leases can and should specify exceptions.
Default Fixture Ownership Rule
Under New York property law, items classified as fixtures (per the annexation-adaptation-intention test, which evaluates how permanently an item is attached, whether it was adapted to the space, and the intent at installation) revert to the landlord at lease end. However, trade fixtures—items installed by the tenant for business purposes that can be removed without material damage—may be taken by the tenant.
Tenants should negotiate upfront:
- Which improvements they may remove (for example, specialized equipment, branded elements)
- Which must stay (for example, partition walls, built-in cabinetry, lighting)
- A clear fixture schedule attached as a lease exhibit
Restoration Clauses
Many commercial leases in NYC require tenants to restore the space to its original condition—or a "white box" standard—at their own expense upon vacating. Restoration costs can be significant and include:
- Removing built walls or glass partitions
- Tearing out cabling and server racks
- Pulling up flooring or custom fixtures
- Demolishing bathroom or pantry improvements
- Repainting or redoing ceilings and lighting
A white box (also called vanilla shell or lit shell) typically means finished drywall with primer or white paint, concrete or subfloor-ready floors, basic HVAC distribution, functional electrical panels, and code-compliant lighting.
Restoration obligations can run well into six figures for a full-floor buildout. Factor these costs into total occupancy calculations when signing—and negotiate caps, waivers, or landlord consent to leave certain improvements in place before you commit.
Document Everything
Tenants should:
- Photograph the space before any improvements begin
- Create a written condition report signed by both parties
- Obtain written confirmation from the landlord about which improvements may remain
This protects against security deposit disputes and removes ambiguity at move-out.
Tax Treatment of Tenant Improvements: Key Considerations
Depreciation for Qualified Improvement Property (QIP)
Tenant improvements placed in service that meet the definition of QIP are generally depreciated over a 15-year life under federal tax law using the straight-line method. IRS Publication 946 (2025) classifies QIP as 15-year property and confirms it is eligible for Section 179 immediate expensing.
Bonus Depreciation Reinstatement
The original TCJA bonus depreciation phase-out schedule was superseded by P.L. 119-21 (the One Big Beautiful Bill Act), which reinstated 100% bonus depreciation for qualified property acquired and placed in service after January 19, 2025. For property acquired before that date but placed in service in 2025, the 40% rate still applies.
In practical terms: improvements placed in service after January 19, 2025 can be fully expensed in year one rather than spread across 15 years — a meaningful difference in after-tax cost for any substantial buildout.
Tax Implications Based on Who Funds the Improvements
Landlord Owns and Pays (No Reimbursement):
- Landlord depreciates the improvements
- No tax consequence to the tenant
Landlord Pays Cash TIA to Tenant:
- Cash payment is typically treated as taxable income to the tenant in the year received
- Tenant may depreciate the cost of improvements it installs
- IRC Section 110 provides a safe harbor specifically for retail space leases (15 years or less), excluding the TIA from taxable income if used to construct improvements that revert to the landlord — office tenants should not assume this safe harbor applies to their leases without confirming with a tax advisor
Tenant Pays Out-of-Pocket:
- Tenant depreciates the improvements over 15 years (or claims bonus depreciation if eligible)
How an improvement is funded — and by whom — directly affects the after-tax cost for both parties. Structuring the TIA correctly in the lease can shift thousands of dollars in tax liability, so looping in a qualified tax advisor before finalizing the deal terms is worth the time.
Frequently Asked Questions
What happens if a tenant makes improvements to the property?
Improvements made without written landlord consent typically become property of the landlord, the tenant may be required to restore the space at their expense, and unauthorized work can be grounds for lease default—making prior written approval essential.
What is an example of a tenant improvement and betterment?
A tenant improvement is any modification that makes the space functional for the tenant's use, such as adding a server room or constructing private offices. A betterment goes further — it also meaningfully increases the property's market value beyond the tenant's own needs, such as upgrading a building's electrical capacity.
What is a reasonable tenant improvement allowance?
TIA amounts vary by market, lease length, and space condition. The national average sits around $87.51/SF, while Manhattan TIAs averaged $138.65/SF in 2024 and fell to $118.65/SF in Q1 2025. Actual NYC buildout costs typically range from $150 to $300/SF — well above the TIA in most cases.
Can a landlord keep tenant improvements after the lease ends?
Yes, permanently attached improvements (fixtures) generally revert to the landlord at lease end unless the lease specifies otherwise — so negotiate fixture ownership and restoration rights before signing.
Do tenants need written permission to make improvements to a commercial space?
Yes, virtually all commercial leases require written landlord consent prior to any alteration, and verbal agreements are insufficient—tenants should always document approvals, scope, materials, and contractor details in writing.
Are tenant improvements tax deductible?
Tenant improvements are depreciated over their useful life — generally 15 years for qualified improvement property (QIP) under current law — not immediately deducted. Property acquired and placed in service after January 19, 2025 may qualify for 100% bonus depreciation. Consult a tax professional for your specific situation.
