Links to subsites such as your Community section are be best placed in the "meta navigation" (also known as universal navigation).
The Nielsen Group explain that:
On large sites with several standalone subsites, universal navigation provides quick access to the main site. To be successful, it must not interfere with the subsite’s navigation.
In short, it's recommended that your first level navigation is only used for navigation of the current sub-site.
Universal navigation is commonly found at the top of the page, so this would also meet user's expectations.
As the Nielsen group also suggest, placing sub-sites above the local navigation makes sense from an information architecture perspective as it adheres to hierarchical ordering:
Ensure a sense of hierarchy if the design displays two navigation bars.
At a glance, people should be able to identify the navigation related to the current site and distinguish it from the universal navigation.