> For the complete documentation index, see [llms.txt](https://orbcity.gitbook.io/orbcity/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://orbcity.gitbook.io/orbcity/building.md).

# Building

- [Building System](https://orbcity.gitbook.io/orbcity/building/building-system.md)
- [Locating System](https://orbcity.gitbook.io/orbcity/building/locating-system.md)
- [$Lay 007 Daily Production](https://orbcity.gitbook.io/orbcity/building/locating-system/usdlay-007-daily-production.md)
- [Number of contractable buildings per district](https://orbcity.gitbook.io/orbcity/building/locating-system/number-of-contractable-buildings-per-district.md)
- [Contract](https://orbcity.gitbook.io/orbcity/building/locating-system/contract.md)
- [Construction System](https://orbcity.gitbook.io/orbcity/building/construction-system.md)
- [Concept](https://orbcity.gitbook.io/orbcity/building/construction-system/concept.md)
- [Time](https://orbcity.gitbook.io/orbcity/building/construction-system/time.md)
- [Chance of construction](https://orbcity.gitbook.io/orbcity/building/construction-system/chance-of-construction.md)
- [Cost](https://orbcity.gitbook.io/orbcity/building/construction-system/cost.md)
- [Upgrading System](https://orbcity.gitbook.io/orbcity/building/upgrading-system.md)
- [Level Up](https://orbcity.gitbook.io/orbcity/building/upgrading-system/level-up.md)
- [Time](https://orbcity.gitbook.io/orbcity/building/upgrading-system/level-up/time.md)
- [Chance of level up](https://orbcity.gitbook.io/orbcity/building/upgrading-system/level-up/chance-of-level-up.md)
- [Cost](https://orbcity.gitbook.io/orbcity/building/upgrading-system/level-up/cost.md)
- [Tier Up(=evolution)](https://orbcity.gitbook.io/orbcity/building/upgrading-system/tier-up-evolution.md)
- [Time](https://orbcity.gitbook.io/orbcity/building/upgrading-system/tier-up-evolution/time.md)
- [Chance of tier up](https://orbcity.gitbook.io/orbcity/building/upgrading-system/tier-up-evolution/chance-of-tier-up.md)
- [Cost](https://orbcity.gitbook.io/orbcity/building/upgrading-system/tier-up-evolution/cost.md)
- [Restoration cost](https://orbcity.gitbook.io/orbcity/building/upgrading-system/tier-up-evolution/restoration-cost.md)
- [LAY-Bours System](https://orbcity.gitbook.io/orbcity/building/lay-bours-system.md)
- [Range & Probability](https://orbcity.gitbook.io/orbcity/building/lay-bours-system/range-and-probability.md)
- [Benefit](https://orbcity.gitbook.io/orbcity/building/lay-bours-system/benefit.md)
- [Green Value System](https://orbcity.gitbook.io/orbcity/building/green-value-system.md)
- [Range & Probability](https://orbcity.gitbook.io/orbcity/building/green-value-system/range-and-probability.md)
- [Benefit](https://orbcity.gitbook.io/orbcity/building/green-value-system/benefit.md)
- [Tax System](https://orbcity.gitbook.io/orbcity/building/tax-system.md)
- [Repair and Maintenance](https://orbcity.gitbook.io/orbcity/building/repair-and-maintenance.md)
- [Time Coupon](https://orbcity.gitbook.io/orbcity/building/time-coupon.md)