The building I am making is from this tutorial http://blendernerd.com/breakfast-hall-%E2%80%93-part-3/. The building is currently in top view and I was wondering how you can go inside by zooming in.
There are several ways: scrolling with the mouse middle button (or using “+” key). From the top view press “CTRL” + “ALT” + “0” (zero) to place the default camera there, then hit “shift” + “f” to enter flying camera mode and scroll with the mouse middle button to zoom in. Also you can create an animation to move the camera along a path traced inside the building.