Christie Brinkley: Buy a Piece of My Hamptons Bliss ... For $30 Million!!

Christie Brinkley's got a slice of heaven for sale in The Hamptons ... but bring a big checkbook.

The supermodel's put up her historic Tower Hill estate for sale ... at $29.5 million. It's got the works, and then some. The gigantic pad sits on 20 acres, featuring 9 bedrooms, 7 bathrooms and 4.5 baths. And how's this for status ... the crib's in the coveted beachside region of Bridgehampton North.

It's the end of an era for Brinkley, who spent 18 years in the historic property built in 1891, which she completely restored.

Check out the pics ... the pad's got a 50-foot observation tower, a massive swimming pool and tennis courts.