modern two-story house 3d model

Recreate a simple modern two-story family house. Large scale building. Approximate size: * Width: 18-22 meters * Length: 14-18 meters * Floor height: 3 meters per floor Exterior structure similar to a standard suburban house with: * Full ground floor * Full second floor * Fully enclosed roof * Front porch * Rectangular layout * Simple architecture Structure only. No furniture. No stairs. No props. No decorations. No people. No vehicles. No vegetation. Requirements: * Complete roof covering entire building * Complete exterior walls * Complete interior walls * Complete floors and ceilings * Closed manifold geometry * Watertight mesh * Straight walls * Flat floors * Proper wall thickness * Large room spaces capable of fitting furniture later * Clean game-ready topology Avoid: * open roof * dollhouse cutaway * exposed interior * shell-only structures * construction framing * floating geometry * tiny rooms * miniature scale * broken topology Prioritize building size and realisti