Passage: It has 355 decorated rooms and a floor area of 200,000 square feet (19,000 m²). The structure includes 700 million bricks and 3.5 million cubic feet (85,000 m³) of stone, with only minimal usage of steel.  Lutyens established ateliers in Delhi and Lahore to employ local craftsmen. The chief engineer of the project was Sir Teja Singh Malik, and four main contractors included Sir Sobha Singh.

Question: How large is the structure?
200,000 square feet (19,000 m²)