# Operating expenses (op-ex)

> The cost of running the building — utilities, maintenance, security, management.

**Canonical URL:** https://classa.info/glossary/operating-expenses
**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 cost of running the building — utilities, maintenance, security, management.
- Op-ex includes utilities, building maintenance, cleaning, security, management fees, insurance, and minor capital items.

## Key facts
- **category**: Lease economics
- **regionScope**: Global

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