Sentence:  The new interchange among the four Los Angeles freeways , including the grade-constructed accesses , occupies by itself no less than eighty acres of <WSD>downtown</WSD> land , one-eighth of a square mile , an area about the size of Rockefeller Center in New York . 
Meaning of the word marked with <WSD> tags:  of or located in the lower part of a town, or in the business center