It's good to know that even though Yankees third baseman Alex Rodriguez has a Metrocard, he's not letting New York real estate brokers down by getting a downmarket walk-up: A-Rod and wife Cynthia have rented a Midtown East apartment in "a full service building with a doorman and concierge. The apartment has views of both the East River and the park, and will have easy access to Yankee Stadium via the FDR Drive." The rent? A cool $20,000 a month. Next up: News of the multimillionaire apartment he will be buying.