Postcard written on November 12, 1971 at "The Hilton Hotel - Beautifully situated, in its own 13 acre park" was sent to a friend or relative at the Hyde Park Hotel in NYC, USA.
Stamp is cancelled with a pictorial postmark showing the hotel. Cancel reads, "HILTON - OSMANBEY - INSTANBUL". Date is not legible.
Presently, there are 5 Hilton Hotels in Istanbul. One of them looks exactly like the hotel on the card. It is the Hilton Istanbul Bosporus. So, the structure was either renamed, or several were built in identical/very similar style and only one remains.