Why Base Building Conditions Matter

The "base building condition" clause defines exactly what the landlord will deliver to you when you take possession of your space. It specifies which systems are included, at what capacity, in what location, and in what operational state. The difference between delivery types can swing your tenant improvement costs by $30–60 per square foot — a difference of $300,000 to $600,000 on a 10,000-SF space.

Yet many tenants sign leases with vague delivery condition language, assuming that "standard" means what they've seen in other spaces. There is no universal standard. What's "base building" in one building — or even one deal within the same building — can differ substantially from another. The only standard is what your lease says.

The Four Primary Delivery Types

1. Shell Space (Cold Dark Shell)

🏗️ Cold Dark Shell — What You Typically Get

Concrete slab floors; structural columns exposed; exterior walls only; no interior demising walls; no HVAC (beyond base building rooftop units, not connected to suite); no interior lighting; electrical service only to building main panel (not to suite panel); plumbing only at common-area restrooms; fire sprinkler main loop but no distribution within suite; no ceiling.

Cold dark shell is the lowest level of finish — essentially, four walls, a floor, a roof, and nothing else. It's the starting point for virtually all industrial spaces and many ground-floor retail spaces. If you're leasing a cold dark shell, budget $50–100/SF in tenant improvements for office or retail, and $20–40/SF for light industrial.

The benefit of shell space is maximum flexibility. You design and build everything to your exact specifications. The cost is time (6–18 months of construction) and money. Landlords in competitive markets often compensate shell tenants with large TI allowances and extended free rent periods.

2. Warm Shell (Warm Vanilla Shell)

🌡️ Warm Vanilla Shell — What You Typically Get

Polished or painted concrete floors; demised perimeter walls (drywall to deck, taped and primed); HVAC roughed-in to suite with VAV boxes or rooftop unit connected and functional; electrical panel installed and energized at suite; conduit stubbed to space; fire sprinklers distributed to code throughout suite; restroom rough-in within suite (for spaces requiring dedicated restrooms); basic lighting circuit in place; no finish flooring; no interior partition walls; no millwork or ceiling tiles.

Warm vanilla shell is the most common delivery condition for office and retail leases in multi-tenant buildings. It provides functional base systems but requires the tenant to build out all interior improvements. TI budgets for warm shell spaces typically run $40–80/SF for office and $30–60/SF for retail.

The "vanilla" designation signals that the space has a basic usable skeleton — you can occupy it in a spartan state, but finishing it to business standards requires substantial investment.

3. Grey Shell / Second-Generation Space

⬜ Grey Shell — What You Typically Get

All base building systems operational and distributed throughout the space; interior partition walls in place (may require modification); ceiling grid and tiles in place; flooring (carpet, VCT, or concrete) in place but potentially worn; HVAC fully connected and functional; electrical outlets distributed throughout; plumbing connected; lighting functional; restrooms complete. Inherited from a prior tenant's build-out, often requiring cosmetic refresh but minimal structural changes.

Second-generation (or "2G") space is a prior tenant's build-out that has been vacated. It may be highly functional if the prior tenant's layout suits your needs, or it may require significant demolition and reconstruction if it doesn't. The key distinction from vanilla shell: all systems are connected and running, but you inherit whatever the prior tenant installed.

TI budgets for 2G space range widely — $10–30/SF for cosmetic refresh, $40–70/SF if substantial reconfiguration is needed. Tenants leasing 2G space should conduct a thorough condition assessment before committing to as-is delivery.

4. Turnkey Delivery

✅ Turnkey — What You Typically Get

Landlord constructs the space to the tenant's approved plans and specifications, funded entirely by the landlord (typically amortized into the lease rent). Tenant takes possession of a fully completed, move-in-ready space. All systems operational, all finishes installed, permits obtained and certificate of occupancy issued. Tenant's only obligation: install furniture, equipment, and IT systems.

Turnkey delivery eliminates construction management burden from the tenant — the landlord manages the general contractor, handles permitting, and delivers a completed space. The tradeoff is that the construction cost is typically baked into the rent via amortization, meaning you pay for the build-out over the lease term rather than via an upfront TI allowance.

Turnkey deals are most common in: (1) build-to-suit industrial/office facilities; (2) competitive office deals where landlords want to simplify the transaction; (3) franchise-build retail where the landlord manages construction to brand standards.

Delivery TypeTypical TI Cost (Tenant)Time to OccupancyBest For
Cold Dark Shell$50–100/SF9–18 monthsIndustrial, ground-up retail
Warm Vanilla Shell$40–80/SF4–8 monthsOffice, multi-tenant retail
Grey Shell (2G)$10–50/SF2–6 monthsBudget-conscious tenants
Turnkey$0 (amortized in rent)0–2 monthsBuild-to-suit, net lease

MEP Stub-Outs: What Your Lease Should Specify

MEP (Mechanical, Electrical, and Plumbing) stub-outs are the base building delivery of utility systems to the boundary of your suite. They are the starting point from which your build-out connects to building infrastructure — and undersized, mislocated, or missing stub-outs are among the most expensive surprises in commercial tenant improvements.

Mechanical (HVAC) Stub-Outs

Your lease should specify, at minimum:

⚠️ Common trap: Many leases state HVAC is "stubbed to the suite" but don't specify capacity. If the rooftop unit serving your 5,000-SF office is a 3-ton unit (designed for 1 ton per 1,667 SF — way below standard), you'll need a new or supplemental unit at your expense. Always get the mechanical engineer's capacity calculations before signing.

Electrical Stub-Outs

Your lease should specify:

Plumbing Stub-Outs

For spaces requiring in-suite plumbing:

ADA Path-of-Travel Allocation

The Americans with Disabilities Act (ADA) creates specific obligations when tenants make alterations to their leased space. Understanding how your lease allocates these obligations is critical — failing to address ADA path-of-travel requirements can expose both landlord and tenant to federal enforcement action and private litigation.

The 20% Rule

Under ADA Title III and DOJ implementing regulations (28 CFR Part 36), when a tenant makes alterations to its space (any modification that affects usability), the tenant must also make the "path of travel" to that space accessible, up to a cost not to exceed 20% of the cost of the alteration.

The "path of travel" includes: the accessible route from building entrance to the tenant's suite; restrooms serving the tenant; drinking fountains; telephones; and parking.

Example: You spend $500,000 improving your office space. The ADA requires you to spend up to $100,000 (20% of $500,000) making the path of travel to your office accessible — upgrading the parking lot striping, improving the entrance ramp, updating common-area restrooms, etc.

Lease Allocation Provisions

Commercial leases typically address ADA path-of-travel in one of three ways:

ApproachLandlord ObligationTenant Obligation
Standard (most common)Base building, core, common areas, exteriorIn-suite alterations + proportional path-of-travel up to 20% rule
Tenant-favorableAll ADA path-of-travel costsIn-suite only
Landlord-favorableNone beyond building permit complianceAll ADA compliance triggered by tenant alterations

Tenants should negotiate for the landlord to bear all ADA costs for common areas, the building entrance, parking, and the vertical circulation (elevators/stairs) — items that the tenant has no ability to control or modify. In-suite ADA compliance (door widths, accessible restrooms within the suite) is typically the tenant's responsibility.

Practical Tips for ADA Negotiation

Landlord Warranty Scope

What does the landlord warrant about the condition of the space at delivery? Less than you might think — and the failure to negotiate a strong warranty can leave you paying for systems failures that existed before you moved in.

Standard Landlord Warranty Language

Most commercial leases include some version of the following landlord warranty:

"Landlord represents that, to Landlord's actual knowledge, the Premises are in compliance with all applicable laws as of the Commencement Date, and that all base building mechanical, electrical, and plumbing systems serving the Premises are in good working order as of the Delivery Date."

This language is weak in several important respects:

Tenant-Protective Warranty Language

Negotiate for a broader warranty that includes:

The Punch List Process

The punch list is one of the most important — and most underutilized — tenant protections in commercial lease delivery. It is your formal documentation of incomplete or deficient work at the time you take possession, and it preserves your right to demand completion without starting the rent clock.

When to Conduct a Punch List Inspection

A punch list inspection should occur:

  1. At substantial completion of landlord's work: Before taking keys and before the lease commencement date, walk the space with your architect, contractor, and a landlord representative
  2. At TI delivery: If the landlord is performing your tenant improvements, conduct a punch list at substantial completion of TI work
  3. At holdover space delivery: If taking additional space mid-lease, conduct a separate punch list for the new space

What to Include on a Commercial Punch List

A thorough punch list should document:

Acceptance and Rejection Rights

Your lease should specify:

Best practice: Never accept delivery of a space without a written punch list. Verbal punch lists are unenforceable. Once you take possession and begin operating, it becomes very difficult to claim the space was not delivered in the agreed condition. Document everything in writing before the first dollar of rent is paid.

Practical Delivery Scenarios

Scenario 1: The Missing VAV Box

A tenant leases 8,000 SF of warm vanilla office space. The lease promises HVAC "distributed to the suite." On punch list walk, the tenant's HVAC engineer discovers that three of the eight zones are missing VAV boxes — the mechanical drawing in the lease exhibit showed them, but they were never installed. The landlord's position: "The main duct is connected, which is 'stubbed to the suite.'" The tenant's position: "The exhibit showed VAV boxes." Without a specific exhibit showing the VAV box locations and capacities, this dispute goes to arbitration — costing both parties money and delaying occupancy. Lesson: get the MEP drawings attached as a lease exhibit and make them part of the delivery obligation.

Scenario 2: The ADA Surprise

A retail tenant spends $800,000 on a flagship store buildout. Two months into construction, the building department notifies the tenant that the main building entrance does not have an accessible ramp and that the tenant must upgrade it as a condition of permitting. Cost: $45,000 — exactly within the 20% ADA path-of-travel rule (20% of $800K = $160K). The tenant's lease allocated all building exterior ADA compliance to the landlord — but the landlord disputes this applies to "triggered" path-of-travel costs. Lesson: explicitly define which ADA path-of-travel costs are triggered by tenant alterations and which party bears them.

✅ 12-Item Base Building Conditions Checklist

  1. Define delivery type explicitly: Shell, warm vanilla, grey shell, or turnkey — require that the specific delivery type be defined in the lease body, not just in verbal representations.
  2. Attach MEP exhibits: Require landlord to attach mechanical, electrical, and plumbing drawings showing all stub-out locations, capacities, and specifications as a binding lease exhibit.
  3. Specify HVAC capacity: Define minimum tons of cooling per 1,000 SF and confirm the base building system can support your planned density and use.
  4. Confirm electrical panel amperage: Verify the electrical panel size and voltage at the suite will support your equipment and lighting loads before signing.
  5. Document plumbing stub-out locations: Get the exact location of water supply and drain stub-outs in writing, especially if your layout depends on specific plumbing locations.
  6. Negotiate landlord ADA warranty: Require landlord to represent that all common areas, parking, building entrance, and path of travel are currently ADA-compliant.
  7. Allocate ADA path-of-travel costs: Explicitly define which party bears ADA path-of-travel costs triggered by tenant alterations — push for landlord responsibility for all common-area and exterior ADA costs.
  8. Conduct a thorough punch list: Hire your architect and MEP engineer to walk the space before taking possession; document every deficiency in writing.
  9. Negotiate a cure period: The punch list agreement should give the landlord 30 days to cure non-material items and 10 days to cure items preventing occupancy, with rent commencement delayed during material defaults.
  10. Require a 90-day systems warranty: Negotiate a warranty that base building mechanical, electrical, and plumbing systems will remain in good working order for at least 90 days after delivery, at landlord's repair cost.
  11. Include abatement/termination remedies: If the space is not delivered in the warranted condition or material punch list items remain uncured, you should have rights to rent abatement and, for material failures, termination.
  12. Inspect for environmental conditions: Require landlord to disclose any known asbestos, lead paint, mold, or other hazardous material conditions, and negotiate a landlord obligation to remediate any discovered conditions at landlord's expense.

Frequently Asked Questions

What is the difference between shell and warm vanilla shell delivery?
A shell space (cold dark shell) is completely raw — concrete floors, exposed structure, no HVAC, no electrical beyond code minimums, no plumbing beyond common-area restrooms. A warm vanilla shell includes base HVAC connected to the suite, an energized electrical panel, sprinklers distributed to code, and typically demised perimeter walls. The difference can be $20–45/SF in TI cost. Understanding exactly which delivery type your lease promises is critical before signing.
Who is responsible for ADA path-of-travel upgrades in a commercial lease?
Under the ADA, when a tenant makes alterations, the tenant must also improve the path of travel to the space up to 20% of the alteration cost. Leases typically allocate building-standard path-of-travel upgrades (elevator, lobby, main entrance) to the landlord, while in-suite and immediate-access-path upgrades fall to the tenant. Always clarify this allocation explicitly in the lease to avoid costly disputes when you begin construction.
What should a commercial lease punch list include?
A thorough punch list should document all HVAC zone functionality, electrical outlet testing, plumbing fixture testing, fire sprinkler placement, door hardware, finish defects, MEP stub-out verification, and telecom infrastructure. The punch list should specify a cure period (30–60 days for non-material items, 10–15 days for items preventing occupancy) and preserve tenant's right to delay rent commencement until material items are resolved.
What is a MEP stub-out in a commercial lease?
MEP stands for Mechanical, Electrical, and Plumbing. A stub-out is the base building delivery of these systems to the boundary of your suite, ready for tenant connection. The exact capacity and location must be specified in a lease exhibit — undersized or missing stub-outs are a common source of costly disputes. For example, if your HVAC ductwork is stubbed to the suite but no VAV boxes are installed, you may face a $15,000–30,000 expense to complete the distribution that you assumed was included.
What does a landlord warranty cover in a commercial lease?
Standard landlord warranties are narrow — they typically cover only that base building systems are in "good working order" at delivery, to the landlord's "actual knowledge." They rarely cover latent defects, and the warranty expires at lease commencement. Negotiate a broader warranty including hazardous material disclosure, a 90-day systems warranty period, and remedies (rent abatement, termination right) if warranty conditions are not met.
What is a turnkey buildout and who pays for it?
In a turnkey delivery, the landlord constructs the tenant's improvements to agreed specifications and delivers a fully built-out, move-in-ready space. The landlord funds all construction costs, typically amortizing them into the lease rent. The risk to the tenant is that change orders are expensive, and the rent implicitly includes the full construction cost — so you're financing the build-out through higher rent over the entire lease term, which may be more expensive than a TI allowance with market-rate rent.

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Conclusion

Base building conditions are not boilerplate — they are the foundation of your entire tenant improvement project and determine how much you'll spend, how long it takes to open, and who bears the risk when systems fail. A vague delivery condition clause is a blank check for disputes.

Before you sign, get MEP drawings attached as a binding exhibit. Conduct a thorough punch list walk with your architect and engineers before taking possession. Negotiate a meaningful landlord warranty with real remedies. Understand exactly who bears ADA path-of-travel costs when your construction begins. And never take possession without a written, signed punch list that documents every deficiency.

The cost of clarity upfront is a few hours of attorney and architect time. The cost of ambiguity can be six figures in unexpected construction costs and months of delayed occupancy.

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