英语翻译the alliance,an initiative between three of the largest

initiative指的是 the ability to decide and act on your own without waiting for somebody to tell you what to do 主动性；积极性；自发性 这样就顺了.
an initiative between three of the largest developers in the country整个作为插入语.这个该国的三大发展商自发的形成的联盟 ,都具有城市再建方面的广泛经验.