Historical clue formulations

• Posh hotel, familiarly — 2017-09-15
• High-end accommodations, familiarly — 2013-01-19
• Posh place to stay in Piccadilly, familiarly — 2007-03-30
• Play for which 59-Across won a Tony, 1975 — 2006-12-11
• Luxury hotel, familiarly — 2004-10-08