If you're referrring to a building, then you say 建筑 If you want to express a idea that a building was built, then you say 建成 As far as i know, 确立 has nothing to do with buildings, it can be translated as ESTABLISH in some contexts though.

建筑 means“ build or building",it could be verb or noun.for example，“The building is tastefully furnished这座建筑装饰得很艺术” 建成 means "built".for example,"Rome was not built in a day.罗马不是一天建成的” 确立 means "establish"，for example,"He established his theory他确立了他的学说"

hei，I'm not a professional.But i really want to recall your question. 建筑,like someting in result,建成,like a process in the final. Best wish~

你好，Yair。根据现代汉语词典，“建筑”意为”兴建土木工程”，如“兴建铁路/水电站/工厂等”，后接具体的建筑物或某种设施。 ”建成”强调“完成建筑某种建筑物或设施” “确立”意为“稳固、坚定地建立或树立”，后接抽象的概念，如“确立地位/价值观/制度等”。不能说“确立房屋或铁路等” Hope this helps!

“建筑”It is noun.It is a general designation about building,tower,bridge,etc. “建成”It is verb.It means that "建筑(buiding,tower,bridge,etc.)" is completed. "确立"It is verb.It means that some thing has been set up.The thing refer to theory,cooperation,community,etc.