> 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/green-value-system.md).

# Green Value System

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

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