According to papers filed in relation to the divorce, the building, purchased in 1980 for a little over $390,000, was worth $5 million in 2002. As 2002 was a bad year for real estate in NYC (after the September 11th attacks), I'm sure this number has migrated upward since then.
http://nycserv.nyc.gov/nycproperty/statements/mvh/jsp/stmtassessmvh.jsp?statementId=95916028
Property Address and Zip Code: Borough:
Block:
Lot:
MANHATTAN
1376
48
34 EAST 62 STREET 10021
Market Value History
2006/07 6,360,000
2005/06 5,530,000
2004/05 4,810,000
2003/04 4,130,000
2002/03 3,900,000