Anchorage/Citadel

[Necroconvict]

Does building it to citadel do anything at all? I think it should... I think going to citadel should help any of the buildings in my opinion.

[felmari]

Mostly designation from outline view to kind of see what you have there.

They could make it like planets I guess where you pick a designation and it gives bonuses to that. Generally the AI though brings enough fleets or tries another entry point though and mid latter game they generally have enough no matter how big a single space port is where they become more support for your own fleets and keeping out the annoying smaller ones.

[bri]

It gives another building slot, allows more defensive platforms, increases the base trade protection amount, increases the hull strength and armor, and adds additional weapon and utility slots,

https://stellaris.paradoxwikis.com/Starbase

Gives the exact breakdown on what each additional level unlocks