INTERNATIONAL AMERICAN <HOME> TO ACQUIRE COS International American Homes Inc said it entered into a conditional contract to acquire the <Maione-Hirschberg Cos Inc> and affiliated entitles for 19 mln dlrs. International American, whose stock was halted on Nasdaq earlier, said the purchase price is payable 12 mln dlrs in cash and the balance in its own common shares. Selling shareholders may earn an additional amount up to a maximum of eight mln dlrs payable in cash based on the future performance of the companies acquired during the three years ending March 31, 1990, International said. The acquisition is subject to certain conditions, such as satisfactory results of due diligence investigations, the company said.