NEW YORK — The partnership that paid a record $5.4 billion for two of New York City's biggest apartment complexes is having money problems. The group led by Tishman Speyer and BlackRock Realty says it wasn't able to make a full $16 million loan payment that was due Friday. The companies say the missed payment won't affect the 25,000 tenants of Stuyvesant Town and Peter Cooper Village in Manhattan. Analysts have been expecting the group to default on the loan for several months. The group bought the complexes in 2006 in the nation's largest residential real estate deal.