Office in section cut 3D model is available on CGTrader for $2. Original author: JindaArch.
BLEND (Blender, filesize: 19.2 MB), OBJ (OBJ, filesize: 27.3 MB), FBX (Autodesk FBX, filesize: 12.4 MB), MAX (Autodesk 3ds Max, filesize: 26.6 MB), GLTF (glTF, filesize: 17.4 MB), STL (Stereolithography, filesize: 9.14 MB), DAE (Collada, filesize: 14.5 MB)