Definition
A work letter is a lease exhibit (or attachment) that spells out the “who, what, and how†of a tenant buildout. It defines the space delivery condition, the tenant improvement (TI) scope and responsibilities, the approval process, the schedule, and how the TI allowance (if any) is funded or reimbursed.
Why It Matters
In many commercial leases, the base lease document sets the legal relationship, but the work letter controls the practical execution that drives real money and risk. A vague work letter can lead to scope creep, delays, lien exposure, unexpected capital costs, and disputed responsibility—directly affecting net effective rent.
What a Work Letter Typically Covers
- Delivery condition: what “as-is,†“shell,†or “vanilla shell†means for the space.
- Landlord work vs. tenant work: who builds what, and who pays for it.
- TI allowance rules: eligible costs, caps, disbursement timing, and documentation required.
- Plans and approvals: design submission requirements, review timelines, and approval standards.
- Permits and compliance: who pulls permits, handles code upgrades, ADA, fire/life-safety tie-ins.
- Construction management: required contractors, insurance, access rules, and site coordination.
- Change orders: how scope changes are approved, priced, and scheduled.
- Payment & lien protection: invoices, lien waivers, retainage, and default remedies.
- Completion standards: substantial completion definition, punch list process, and handoff.
- Timing milestones: delivery date, commencement triggers, and any free rent conditions.
Shell Space Connection
Work letters are especially important when leasing shell space because more of the project is undefined at lease signing. In shell deals, the work letter often dictates whether the landlord is simply providing an allowance or also delivering key infrastructure (HVAC, electrical service, restrooms, storefront, etc.).
Investor Uses
- Underwriting TI exposure: confirm what costs are truly landlord-funded vs. tenant-funded.
- Schedule risk management: evaluate how long until rent starts and whether delays shift costs.
- Comparing offers: two leases with the same face rent can be very different based on the work letter.
- Controlling scope creep: define eligible TI, approvals, and change order limits.
Example
A tenant signs a lease with a $30/SF TI allowance. The work letter specifies that TI can reimburse only interior non-structural improvements and requires:
- Landlord pre-approval of plans and contractor
- Paid invoices + unconditional lien waivers for reimbursement
- Maximum construction period before rent commences regardless of completion
That structure protects the landlord from paying for ineligible items, reduces lien risk, and limits open-ended delays.
Common Pitfalls
- Undefined delivery condition: “vanilla shell†without detail invites disputes.
- Loose approval timelines: delays can stack up if review windows aren’t defined.
- No change order controls: scope creep becomes a budget creep.
- Weak lien protections: reimbursements without lien waivers can create mechanic’s lien risk.
- Rent commencement ambiguity: unclear triggers can turn into free rent by default.
- Misaligned incentives: if the landlord carries too much schedule risk, tenants may move slower.