Hello YAD Arquitectura. Thanks for your question. A building like this will probably need a small technical area, but within the scope of this ideas competition it is not critical that you solve those spaces. You are welcome to do so of course, but if you do this area will only take up a few square meters and therefore it wont really affect the proposed total area with the % margin suggested. Remember this is an ideas competition, so the jury will not be measuring every project to verify the areas are respected to the meter. The jury is formed by a group of professionals though who have a very well-trained eye, so if the areas are 50% over the limit they will definitely spot that. As long as your built up area looks reasonable in relationship to the brief the jury will be focusing a lot more on your concept and relationship between spaces rather than in the exact area of each space.