Core & Shell vs. Tenant Improvement (TI)
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Here's a concept unique to commercial that confuses a lot of newcomers: a building can be "finished" and completely empty inside — on purpose. Welcome to core-and-shell and tenant improvements, one of the biggest and most active corners of commercial construction. Let's clear it up.
The two
- Core & shell (base building): the structure, envelope, lobby, and core (elevators, stairs, restrooms, main MEP) — built by the developer, often leaving the tenant floors as an empty "shell."
- Tenant improvement (TI) / fit-out: building out a tenant's space (offices, a store, a restaurant) within that shell — frequently in an occupied building, on fast schedules, and finish-heavy.
- The lease's work letter defines who pays for and performs what (landlord vs. tenant).
Going Deeper (Intermediate)
Developers build shell-only for leasing flexibility — each tenant fits out to their own needs. TI is a huge-volume niche (fast turns, repeat clients, brand rollouts), but it means working in occupied buildings (after-hours, dust/noise control, tying into base-building systems) and managing the TI allowance.
Advanced / Pro-Level
The TI business model rewards speed, relationships, and brand-standard compliance (retail/restaurant rollouts). The hard parts are base-building-vs-TI coordination (tying into the core's MEP) and the landlord/tenant scope split in the work letter. TI is one of the best entry points into commercial GC work.
Practice Challenge
A developer finishes a 10-story office building, but several floors are empty, drywall-less shells. Why would they do that on purpose? (Answer: it's core & shell — the developer builds the base building (structure, envelope, core/MEP) and leaves tenant floors as shell so each tenant's space can be fit out (TI) to their needs, per the lease work letter. It's intentional, giving leasing flexibility — and that TI work is a major, active part of commercial construction.)
Takeaway: Commercial splits work into core & shell (the developer's base building — structure, envelope, core/MEP) and tenant improvement/fit-out (building out a tenant's space within the shell, often in an occupied building); the lease work letter splits the scope, and TI is a huge, fast-moving niche and a great way into commercial.
Educational overview — every commercial project, owner, and jurisdiction differs; follow your specific contract documents, the adopted codes, and the building official.