This will ship via a USPS Priority Mail. Each floor will be placed in a ziplock bag then wrapped in bubblewrap. I do expect some of the pieces to fall apart during shipping. So, make sure you have enough experience to be able to reconstruct the building from pictures. This was built freehand, so there are no instructions. But I can provide pictures of how it was constructed.

This is a custom designed MOC of Harry Potter Ollivanders. It is a modular building designed to fix in at a scale with other LEGO modular builds. 

It is 3 stories tall. It has a full interior full of shelfs and wands. There are steps that take you between the levels. Below is a Youtube video of the build for more details.