Hamilton killed the deal last week because New York Bancorp's stock fell below $20, triggering a walk-away clause in the merger agreement. New York Bancorp has until Jan. 26 to make a new proposal. With budget cuts hurting the Parks Department, Commissioner Henry Stern proposed that residents surrounding Central Park pay a special tax to finance upkeep of the park. The cost would be about $100 a year for each household in a four-block area that surrounds the park. Critics said they feared the creation of a two-tier system for the city's parks with only those sections in well-off areas being maintained. Pulled down by trading losses, the devaluation of the Mexican peso and lower income from interest, New York money center banks announced financial results that were below expectations for the fourth quarter. For the fourth quarter, Chase Manhattan Corp.'s net income fell 26.8% to $229 million while Chemical Banking Corp declined 48.4% to $179 million.