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NEW YORK CITY — New York-based SL Green Realty Corp. has acquired all of the interests in 51 E. 42nd St., a Midtown Manhattan office building. The 18-story, 142,000-square-foot building is 94 percent occupied. SL Green acquired the interest for a reported $18 million. SL Green now owns all of the buildings on the block bounded by Madison and Vanderbilt avenues between East 42nd and East 43rd streets. The other buildings include 317 Madison Ave., acquired in 2001, and 331 Madison Ave. and 48 E. 43rd St., both of which were acquired in 2007.