Bill Ackman's Pershing Square is offering to take over the rest of Howard Hughes Holdings the investment firm does not own for $85 a share."While we are pleased with the substantial business progress Howard Hughes Holdings has made over the more than 14 years since it went public, we, like other long-term shareholders and this board, have been displeased with the Company's stock price performance," wrote Ackman in a letter to the Howard Hughes board.Ackman proposed forming a new subsidiary of Pershing, whic ...