There obviously was central planning for the parts Ryan built (and coordination with others who put their fortunes into building THEIR chunks of Rapture) The terrain itself was a limitation. Solid Rock is good to build on to anchor structures properly , while plains of silt and debris rock are problematic. Connections to other buildings and transportation infrastructure would need to be made at various points. Outside Rapture itself there was much available space, but distance was the issue - until it became the reason for building in such places. --- --- --- --- --- --- --- --- --- . --- --- --- . .