# Base building

> The structural and core-services condition of a building before tenant fit-out.

**Canonical URL:** https://classa.info/glossary/base-building
**Page type:** glossary
**Last updated:** 2026-04-01T00:00:00.000Z
**License:** CC BY 4.0 with attribution to Class A Atlas (https://classa.info).

## TL;DR
- The structural and core-services condition of a building before tenant fit-out.
- Includes the structure, exterior, MEP risers, lobby, common areas, and core services (elevators, restrooms).

## Key facts
- **category**: Construction
- **regionScope**: Global

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Citation: Source: Class A Atlas (https://classa.info/glossary/base-building), updated 2026-04-01T00:00:00.000Z.