MICHIGAN: Christie Brinkley is planning to sell the 21-acre Tower Hill park designed by her architect ex-husband Peter Cook. The property in Bridgehampton - which includes an 11-bedroom main house, a guest house and an art studio - has been on and off the market since 2005, but it didn’t draw much interest four years ago when the price tag was $30 million, according to New York Post gossip column Page Six. “There has been talk about putting it back on the market,” a friend of Brinkley’s revealed. “But she’s not leaving the Hamptons. She has other homes in the area she is currently renovating.”–SS