The great château posed a political as much as a financial problem. To live there was to declare oneself the Bourbons' successor before a France that had made the Revolution; to restore it meant sums even the imperial civil list could not absorb. Napoleon had estimates drawn up, considered an imperial palace, then a museum, and let the project sleep.
He chose the Grand Trianon: smaller, more manageable, without court memory. The refurnishing of 1809-1810, prepared for Marie Louise's arrival, mobilised Jacob-Desmalter, the silks of Lyon and the Paris bronze-makers. Bedrooms, salons, the mirror room, the Cotelle gallery: it was delivered fast and with rare stylistic coherence.
The imperial couple stayed there several times between 1810 and 1813. The Petit Trianon was put at Pauline Borghese's disposal; other buildings on the estate served as administrative annexes. An emptied Versailles served as a reserve: furniture and paintings were drawn from it to fit out the other palaces.
The paradox has lasted. Because it was furnished all at once and little altered afterwards, the Grand Trianon preserves today, better than Fontainebleau or Compiègne, the exact look of an imperial residence of 1810. The Empire did not want Versailles, but Versailles is where it left its most intact interior.