Best way to make a building animation

Hey Guys,

im building a city-builder game and i wanted to get your input on the best (performance wise) way to simulate a building being build. I have 5 .fbx models for different stages of the building progress (20%,40%,60%,80%,100% done). So my question is what is the best way to add these models in the game and change them out during the building progress.

should i add all models to an empty game object and just switch the activity on and off ? should i make prefabs for all models and switch them out on a gameobject? or should i do something completely different?

thanks!