Is it possible to build a flat in top floor of a building which will not be excessively hot during summer?

A flat under construction is available for sale in a good locality. I am interested but worried because it is on the top floor and is likely to be extremely hot during summer. Can anybody please suggest if there is any way to build the flat in the topmost floor so that it won't be excessively hot during summer? I mean the construction itself should be so that the rooms would not be too hot. Installation of air conditioners is a different issue I am not considering at the moment. Thanks.