building

Attachment 18865

here is an example. check the last one, it say to build this one we need to construct another item of this category and all other facilities at level 9

Your hospital is still under constrution, thats Why you cant build anything else, under then that your stadium can still be upgrated.

thanks you guys. reading your advices and putting 1 and 1 together, i finally got the answers. thank you and sorry to have bothered you guys.