> 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/lay-bours-system.md).

# LAY-Bours System

$$
Tier\~Up=LayBours\_{n}+1
$$

Lay-Bours, one of the building's dynamic property values. Lay-Bours starts with a value of 1. The only way to increase the value of a building's Lay-Bours property is through tier up(=evolution).