Historical clue formulations

• Luxury — 2017-07-11
• Richness — 2008-01-13
• Plenty — 2007-02-18
• A billionaire might live in it — 2005-07-14
• Plenty — 2004-11-13
• Plenty — 2004-05-01
• Evident wealth — 2000-10-15
• Plenty — 1999-04-04
• Conspicuous wealth — 1996-02-12