I want to know the answer to the following question:
The previous record beaten by Park Avenue was for what real estate?
All the background I'm provided with is that "450 Park Avenue was sold on July 2, 2007 for US$510 million, about $1,589 per square foot ($17,104/m²), breaking the barely month-old record for an American office building of $1,476 per square foot ($15,887/m²) set in the June 2007 sale of 660 Madison Avenue.". Is that enough to answer the question?