In 1928, he co-founded the law firm Wien Lane & Malkin now Wien and Malkin, which became a leading national law firm specializing in real estate law. In 1958, his son-in-law
Peter L. Malkin became a partner in his law firm, which was renamed Wien,Lane & Malkin (now Wien and Malkin}. His syndicates purchased, or controlled through long-term ground leases, many of New York City's most prominent landmarks, including the
Empire State Building (which he bought with partner
Harry Helmsley in 1961 from
Henry Crown), the
Equitable Building, the
Graybar Building, the Fisk Building, the Garment Centre Capitol Building, the Fifth Avenue Building, the
Lincoln Building as well as many prominent hotels including the
Plaza Hotel, the
Taft Hotel,
Hotel St. Moritz, the
Lexington Hotel, and the Hotel Governor Clinton. Wien also participated in transactions in Newark, Palm Beach, Philadelphia, Los Angeles, Minneapolis, and Las Vegas. == Philanthropy ==