"What I'm trying to do now in my life - not just with the building, but with everything - is to construct things that will have enduring qualities, and won't just be ephemeral flashes in the pan"

Sylvester Stallone is emphasizing the value of developing things that will have an enduring effect. He is not just referring to the structure he is building, however to all elements of his life. He wishes to develop something that will stand the test of time, instead of something that will be rapidly forgotten. He is striving to develop something that will be remembered and appreciated for years to come. He is seeking to develop something that will have a lasting tradition, rather than something that will be a short lived moment in time. He is wanting to develop something that will be remembered and appreciated for generations to come. He is aiming to produce something that will have an enduring effect on the world.