Ten-Inch Building Print Model

I want to turn my 180-million-triangle photogrammetry capture of a building into a clean, watertight file that prints nicely at just ten inches tall. Because this is strictly for personal display, I only need the overall structure—no intricate façade details or tiny textures... (Budget: $250 - $750 USD, Jobs: 3D Animation, 3D CAD, 3D Design, 3D Modelling, 3D Rendering, 3ds Max, Blender)