The original data for this project was submitted by Gary Hartman at Sunlit Architecture. The data was good, but had many of the typical problems that i see when trying to convert architecture CAD into 3D printable CAD.
The major hurdles of trying to convert architectural CAD into 3D printable CAD are detail tolerances and the generation of a water tight model before export. With this particular project the detail tolerances were mainly too small on the handrails (balcony and stairs). This is usually an intuitive fix because the elements are in plain view and easily fattened so as not to break during fabrication in the 3D printer.