A variety of considerations have to be taken into account, not the least of which is rights to light compliance.
Around the globe, a number of countries have developed laws that protect tenants of existing buildings from an infringement of the natural light they receive.
Put simply, rights to light compliance is not a consideration that can be saved for the finishing touches of construction planning and execution.
Fitting into a greater Building Information Modeling (BIM) Framework, they calculate and project the way your building will influence the natural light received by existing structures around you.
In Denmark, a law determines exactly how much direct sunlight an apartment must receive.
The nuances of these four examples alone show just how much rights to light law differs across the globe.