Hi. Actually you have to edit your random buildings generator. Things that needed to be changed is Random Integer, Random Float nodes and so on (Random * In Range too). You can just search it over blueprint using “Random” keyword. This nodes should be replaced by them equivalents with “From Stream” addition. Then you have to create a Stream variable somewhere (in your BP for example), this value will be the “Seed” of generation. And connect it to every stream input of random nodes you made. As result setting specific seed will give you the same building each time.